chore(all): auto-regenerate gapics (#5920)

* chore(all): auto-regenerate gapics

This is an auto-generated regeneration of the gapic clients by
cloud.google.com/go/internal/gapicgen. Once the corresponding genproto PR is
submitted, genbot will update this PR with a newer dependency to the newer
version of genproto and assign reviewers to this PR.

If you have been assigned to review this PR, please:

- Ensure that the version of genproto in go.mod has been updated.
- Ensure that CI is passing. If it's failing, it requires your manual attention.
- Approve and submit this PR if you believe it's ready to ship.

Corresponding genproto PR: googleapis/go-genproto#797

Changes:

feat(eventarc/publishing): Add publishing methods for channel resources
  PiperOrigin-RevId: 442858558
  Source-Link: googleapis/googleapis@726dac2

fix(dialogflow): correct broken ConversationModelEvaluation resource pattern
  PiperOrigin-RevId: 442646533
  Source-Link: googleapis/googleapis@b62c562

feat(securitycenter): Add connection and description field to finding's list of attributes
  PiperOrigin-RevId: 442589635
  Source-Link: googleapis/googleapis@50fc834

docs(dialogflow/cx): minor wording update
  PiperOrigin-RevId: 442267541
  Source-Link: googleapis/googleapis@740f072

docs(dialogflow/cx): minor wording update
  PiperOrigin-RevId: 442267451
  Source-Link: googleapis/googleapis@4445d18

bigtable/go.mod

@@ -10,8 +10,8 @@ require (
 	github.com/google/btree v1.0.1
 	github.com/google/go-cmp v0.5.7
 	github.com/googleapis/gax-go/v2 v2.3.0
-	golang.org/x/oauth2 v0.0.0-20220411215720-9780585627b5
-	golang.org/x/sys v0.0.0-20220412211240-33da011f77ad
+	golang.org/x/oauth2 v0.0.0-20220411215720-9780585627b5 // indirect
+	golang.org/x/sys v0.0.0-20220412211240-33da011f77ad // indirect
 	google.golang.org/api v0.74.0
 	google.golang.org/genproto v0.0.0-20220407144326-9054f6ed7bac
 	google.golang.org/grpc v1.45.0