chore(main): release Google.Api.Gax 2.3.0-beta01

[release-please]

Auto-generated release PR: merge to trigger a release

2.3.0-beta01 (2022-12-08)

Features

• Add scoped self-signed JWT support for REST (8f62655)
• Improve handling of bad/missing/unsupported methods in REGAPIC (703f386), closes #623
• Improve server streaming exception behavior (28f759a)
• Regenerate common protos (4e6ec67)
• rest server streaming support (a7f122a)

Bug Fixes

• Change default for UseSelfSignedJwtsWithScopes in REST to false (20663c1)
• Close TextReader when we've found the end of responses (302e8b6)
• Dispose of CancellationTokenSources when a method is "done" (c6e3502), closes #592
• Drop trailing hex characters from version header values (b3e2cf9), closes #636
• Fix cancellation (including deadlines) for REGAPIC streaming (3df4f82), closes #648
• Fix error handling for server-streaming REGAPIC (9b0336f), closes #655
• Keep the gRPC full method name in RestServiceCollection (fcb1173), closes #650
• Throw RpcException if transcoding fails (49c7349), closes #659

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This PR was generated with Release Please. See documentation.

[release-please]

🤖 Release is at https://github.com/googleapis/gax-dotnet/releases/tag/Google.Api.Gax-2.3.0-beta01 🌻

[release-trigger]

Triggered job: cloud-sharp/gax-dotnet/gcp_windows/autorelease (2022-12-08T11:21:25.539Z)

To trigger again, remove the autorelease: triggered label (in a few minutes).

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