chore(all): auto-regenerate .pb.go files (#764)

This is an auto-generated regeneration of the .pb.go files by
cloud.google.com/go/internal/gapicgen. Once this PR is submitted, genbot will
update the corresponding PR to depend on the newer version of go-genproto, and
assign reviewers. Whilst this or any regen PR is open in go-genproto, genbot
will not create any more regeneration PRs. If all regen PRs are closed,
gapicgen will create a new set of regeneration PRs once per night.

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

- 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. That will prompt
genbot to assign reviewers to the google-cloud-go PR.

Corresponding google-cloud-go PR: googleapis/google-cloud-go#5675

Changes:

chore(bazel): update gapic-generator-php to v1.4.5
  Changes include:
  - backwards compat patch for Spanner v1 CreateSession

  PiperOrigin-RevId: 429584109
  Source-Link: googleapis/googleapis@6481719

docs(contactcenterinsights): Updating copyright to 2022
  PiperOrigin-RevId: 429555895
  Source-Link: googleapis/googleapis@c222724

chore(analytics/admin): Add service_yaml config to all BUILD.bazel files that generate C# GAPIC libraries
  PiperOrigin-RevId: 429496116
  Source-Link: googleapis/googleapis@7bc124c

regen.txt

@@ -1 +1 @@
-ab177dc72900c95d76812d4e88256b96d41099d7
+6481719e9b6ca54e7d4d5fde4d7aa63729586ee3