chore(all): auto-regenerate .pb.go files (googleapis#923)

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#6887

Changes:

feat(spanner): Update transaction.proto to include different lock modes
  PiperOrigin-RevId: 481838475
  Source-Link: googleapis/googleapis@922f1f3

chore: regenerate API index

  Source-Link: googleapis/googleapis@6511fde

feat: initial generation of APIs
  This is the first release of the storageinsights client APIs.

  PiperOrigin-RevId: 481818508
  Source-Link: googleapis/googleapis@b3195f8

docs: add comment about max number of restrictions in filter queries
  PiperOrigin-RevId: 481795793
  Source-Link: googleapis/googleapis@87d221a

chore: regenerate API index

  Source-Link: googleapis/googleapis@1871952

feat(kms): enable generation of Locations mixin
  PiperOrigin-RevId: 481650929
  Source-Link: googleapis/googleapis@62e82e7

chore: regenerate API index

  Source-Link: googleapis/googleapis@d6f71e3

feat(channel): Add CloudChannelReportsService to CloudChannel API
  PiperOrigin-RevId: 481642499
  Source-Link: googleapis/googleapis@0c78b0c

docs: Refine GPU drivers installation proto description docs: Refine comments for deprecated proto fields docs: Update the API comments about the device_name
  PiperOrigin-RevId: 481282173
  Source-Link: googleapis/googleapis@e981f84

chore: regenerate API index

  Source-Link: googleapis/googleapis@87b4713

feat(securitycenter): Adding project/folder level parents to notification configs in SCC
  PiperOrigin-RevId: 481230115
  Source-Link: googleapis/googleapis@94efa50