Release Google.Cloud.Audit version 2.3.0

[jskeet]

Changes in this release:

No API surface changes; just dependency updates.

[github-actions]

Pull request diff results
Building Google.Cloud.Audit
Detecting changes for Google.Cloud.Audit
Diff level: Identical

Checking compatibility with previous releases
Checking compatibility for Google.Cloud.Audit version 2.3.0
Differences from 2.2.0
Diff level: Identical

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[yoshi-automation]

• Created release for Google.Cloud.Audit-2.3.0

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[release-tool-publish-reporter]

Release build succeeded.