Update changelog and version after v2.1.19

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CodeQL Action Changelog
 
+## [UNRELEASED]
+
+No user facing changes.
+
 ## 2.1.19 - 17 Aug 2022
 
 - Add the ability to filter queries from a code scanning run by using the `query-filters` option in the code scanning configuration file. [#1098](https://github.com/github/codeql-action/pull/1098)

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "codeql",
-  "version": "2.1.19",
+  "version": "2.1.20",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "codeql",
-      "version": "2.1.19",
+      "version": "2.1.20",
       "license": "MIT",
       "dependencies": {
         "@actions/artifact": "^1.0.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "codeql",
-  "version": "2.1.19",
+  "version": "2.1.20",
   "private": true,
   "description": "CodeQL action",
   "scripts": {