go: update most dependencies to the latest version

It's a lot of work for dependabot for our outdated deps, let's
help it by making one huge manual update.

Signed-off-by: Ondřej Budai <ondrej@budai.cz>

vendor/github.com/cenkalti/backoff/v4/.gitignore

@@ -20,3 +20,6 @@ _cgo_export.*
 _testmain.go
 
 *.exe
+
+# IDEs
+.idea/

vendor/github.com/cenkalti/backoff/v4/.travis.yml

@@ -1,6 +1,6 @@
 language: go
 go:
-  - 1.12
+  - 1.13
   - 1.x
   - tip
 before_install:

vendor/github.com/cenkalti/backoff/v4/README.md

@@ -11,8 +11,7 @@ The retries exponentially increase and stop increasing when a certain threshold
 
 Import path is `github.com/cenkalti/backoff/v4`. Please note the version part at the end.
 
-godoc.org does not support modules yet,
-so you can use https://godoc.org/gopkg.in/cenkalti/backoff.v4 to view the documentation.
+Use https://pkg.go.dev/github.com/cenkalti/backoff/v4 to view the documentation.
 
 ## Contributing
 
@@ -20,7 +19,7 @@ so you can use https://godoc.org/gopkg.in/cenkalti/backoff.v4 to view the docume
 * Please don't send a PR without opening an issue and discussing it first.
 * If proposed change is not a common use case, I will probably not accept it.
 
-[godoc]: https://godoc.org/github.com/cenkalti/backoff
+[godoc]: https://pkg.go.dev/github.com/cenkalti/backoff/v4
 [godoc image]: https://godoc.org/github.com/cenkalti/backoff?status.png
 [travis]: https://travis-ci.org/cenkalti/backoff
 [travis image]: https://travis-ci.org/cenkalti/backoff.png?branch=master
@@ -30,4 +29,4 @@ so you can use https://godoc.org/gopkg.in/cenkalti/backoff.v4 to view the docume
 [google-http-java-client]: https://github.com/google/google-http-java-client/blob/da1aa993e90285ec18579f1553339b00e19b3ab5/google-http-client/src/main/java/com/google/api/client/util/ExponentialBackOff.java
 [exponential backoff wiki]: http://en.wikipedia.org/wiki/Exponential_backoff
 
-[advanced example]: https://godoc.org/github.com/cenkalti/backoff#example_
+[advanced example]: https://pkg.go.dev/github.com/cenkalti/backoff/v4?tab=doc#pkg-examples

vendor/github.com/cenkalti/backoff/v4/context.go

@@ -57,10 +57,6 @@ func (b *backOffContext) NextBackOff() time.Duration {
 	case <-b.ctx.Done():
 		return Stop
 	default:
+		return b.BackOff.NextBackOff()
 	}
-	next := b.BackOff.NextBackOff()
-	if deadline, ok := b.ctx.Deadline(); ok && deadline.Sub(time.Now()) < next { // nolint: gosimple
-		return Stop
-	}
-	return next
 }

vendor/github.com/cenkalti/backoff/v4/exponential.go

@@ -115,11 +115,13 @@ func (b *ExponentialBackOff) Reset() {
 // 	Randomized interval = RetryInterval * (1 ± RandomizationFactor)
 func (b *ExponentialBackOff) NextBackOff() time.Duration {
 	// Make sure we have not gone over the maximum elapsed time.
-	if b.MaxElapsedTime != 0 && b.GetElapsedTime() > b.MaxElapsedTime {
+	elapsed := b.GetElapsedTime()
+	next := getRandomValueFromInterval(b.RandomizationFactor, rand.Float64(), b.currentInterval)
+	b.incrementCurrentInterval()
+	if b.MaxElapsedTime != 0 && elapsed+next > b.MaxElapsedTime {
 		return b.Stop
 	}
-	defer b.incrementCurrentInterval()
-	return getRandomValueFromInterval(b.RandomizationFactor, rand.Float64(), b.currentInterval)
+	return next
 }
 
 // GetElapsedTime returns the elapsed time since an ExponentialBackOff instance
@@ -143,7 +145,7 @@ func (b *ExponentialBackOff) incrementCurrentInterval() {
 }
 
 // Returns a random value from the following interval:
-// 	[randomizationFactor * currentInterval, randomizationFactor * currentInterval].
+// 	[currentInterval - randomizationFactor * currentInterval, currentInterval + randomizationFactor * currentInterval].
 func getRandomValueFromInterval(randomizationFactor, random float64, currentInterval time.Duration) time.Duration {
 	var delta = randomizationFactor * float64(currentInterval)
 	var minInterval = float64(currentInterval) - delta

vendor/github.com/cenkalti/backoff/v4/go.mod

@@ -1,3 +1,3 @@
 module github.com/cenkalti/backoff/v4
 
-go 1.12
+go 1.13

vendor/github.com/cenkalti/backoff/v4/retry.go

@@ -1,6 +1,9 @@
 package backoff
 
-import "time"
+import (
+	"errors"
+	"time"
+)
 
 // An Operation is executing by Retry() or RetryNotify().
 // The operation will be retried using a backoff policy if it returns an error.
@@ -53,11 +56,16 @@ func RetryNotifyWithTimer(operation Operation, b BackOff, notify Notify, t Timer
 			return nil
 		}
 
-		if permanent, ok := err.(*PermanentError); ok {
+		var permanent *PermanentError
+		if errors.As(err, &permanent) {
 			return permanent.Err
 		}
 
 		if next = b.NextBackOff(); next == Stop {
+			if cerr := ctx.Err(); cerr != nil {
+				return cerr
+			}
+
 			return err
 		}
 
@@ -88,8 +96,16 @@ func (e *PermanentError) Unwrap() error {
 	return e.Err
 }
 
+func (e *PermanentError) Is(target error) bool {
+	_, ok := target.(*PermanentError)
+	return ok
+}
+
 // Permanent wraps the given err in a *PermanentError.
-func Permanent(err error) *PermanentError {
+func Permanent(err error) error {
+	if err == nil {
+		return nil
+	}
 	return &PermanentError{
 		Err: err,
 	}

vendor/github.com/cenkalti/backoff/v4/ticker.go

@@ -33,6 +33,9 @@ func NewTicker(b BackOff) *Ticker {
 // NewTickerWithTimer returns a new Ticker with a custom timer.
 // A default timer that uses system timer is used when nil is passed.
 func NewTickerWithTimer(b BackOff, timer Timer) *Ticker {
+	if timer == nil {
+		timer = &defaultTimer{}
+	}
 	c := make(chan time.Time)
 	t := &Ticker{
 		C:     c,