Bump cloud.google.com/go/pubsub from 1.19.0 to 1.20.0

Bumps [cloud.google.com/go/pubsub](https://github.com/googleapis/google-cloud-go) from 1.19.0 to 1.20.0.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/main/CHANGES.md)
- [Commits](https://github.com/googleapis/google-cloud-go/compare/pubsub/v1.19.0...pubsub/v1.20.0)

---
updated-dependencies:
- dependency-name: cloud.google.com/go/pubsub
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -4,7 +4,7 @@ go 1.18
 
 require (
 	cloud.google.com/go v0.100.2 // indirect
-	cloud.google.com/go/pubsub v1.19.0
+	cloud.google.com/go/pubsub v1.20.0
 	cloud.google.com/go/storage v1.22.0
 	github.com/Azure/azure-pipeline-go v0.2.3
 	github.com/Azure/azure-storage-blob-go v0.14.0

go.sum

@@ -59,8 +59,9 @@ cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2k
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
 cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
 cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
-cloud.google.com/go/pubsub v1.19.0 h1:WZy66ga6/tqmZiwv1jwKVgqV8FuEuAmPR5CEJHNVCZk=
 cloud.google.com/go/pubsub v1.19.0/go.mod h1:/O9kmSe9bb9KRnIAWkzmqhPjHo6LtzGOBYd/kr06XSs=
+cloud.google.com/go/pubsub v1.20.0 h1:QuwfH5BpEIE9T3n0YK3PKlsXi/TmHMu593UpOVlWygI=
+cloud.google.com/go/pubsub v1.20.0/go.mod h1:IbztU2hgrVroK+PUU6H42CcL0ISZuyOOlrnReZj6Uv8=
 cloud.google.com/go/secretmanager v1.3.0/go.mod h1:+oLTkouyiYiabAQNugCeTS3PAArGiMJuBqvJnJsyH+U=
 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=