release: sourcegraph@3.23.0

[uwedeportivo]

This pull request is part of the Sourcegraph 3.23.0 release.

• Release campaign
• Tracking issue

⚠️ Additional changes required

• Update the upgrade guides in doc/admin/updates
• Ensure all other pull requests in the campaign have been merged - then run yarn run release release:finalize to generate the tags required, re-run Buildkite on this branch, and ensure the build passes before merging this pull request

cc @uwedeportivo

[sourcegraph-bot]

Notifying subscribers in CODENOTIFY files for diff 82c0c23...a92af30.

Notify	File(s)
@christinaforney	doc/admin/external_services/postgres.md doc/admin/external_services/redis.md doc/admin/install/docker-compose/index.md doc/admin/install/docker/aws.md doc/admin/install/docker/digitalocean.md doc/admin/install/docker/google_cloud.md doc/admin/install/docker/index.md doc/admin/postgres.md doc/admin/pprof.md doc/admin/repo/custom_git_or_ssh_config.md doc/admin/ssl_https_self_signed_cert_nginx.md doc/dev/background-information/testing.md doc/index.md
@sourcegraph/distribution	doc/admin/postgres.md doc/admin/pprof.md doc/admin/ssl_https_self_signed_cert_nginx.md