build(deps): bump github.com/vmware/govmomi from 0.23.0 to 0.26.1

Bumps [github.com/vmware/govmomi](https://github.com/vmware/govmomi) from 0.23.0 to 0.26.1.
- [Release notes](https://github.com/vmware/govmomi/releases)
- [Changelog](https://github.com/vmware/govmomi/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vmware/govmomi/compare/v0.23.0...v0.26.1)

---
updated-dependencies:
- dependency-name: github.com/vmware/govmomi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/vmware/govmomi/vim25/progress/reader.go

@@ -36,6 +36,9 @@ type readerReport struct {
 }
 
 func (r readerReport) Percentage() float32 {
+	if r.size <= 0 {
+		return 0
+	}
 	return 100.0 * float32(r.pos) / float32(r.size)
 }