Update gitignore (#5310)

.gitignore

@@ -14,6 +14,7 @@ vendor/
 .sandbox-config
 .github_token
 .wp-env.override.json
+.pub-git-hash
 
 #Ignoring headstart files
 */inc/headstart/*
@@ -346,6 +347,7 @@ twentytwelve/
 twentytwenty/
 twentytwentyone/
 twentytwentyone-blocks/
+twentytwentytwo/
 typo/
 under-the-influence/
 unsleepable/