feat(auth): add deprecation warning for grpcio < 1.83.0 (PQC support) - #18070
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This pull request introduces a deprecation warning for grpcio versions older than 1.83.0 to prepare for the migration to Post-Quantum Cryptography (PQC). The review feedback identifies an issue with the version parsing logic, which incorrectly handles pre-release versions (such as '1.83.1rc1') and shorter version strings (such as '1.83'), causing them to trigger the deprecation warning erroneously. A robust parsing implementation is suggested to resolve this issue.
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…#18070) Emits a deprecation `FutureWarning` when `google.auth.transport.grpc` is imported with `grpcio < 1.83.0`. In October 2026, Google Cloud client libraries (including `google-auth`) will raise minimum requirements to enforce `grpcio >= 1.83.0` for Post-Quantum Cryptography (PQC) support. Towards: b/537446703
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Emits a deprecation
FutureWarningwhengoogle.auth.transport.grpcis imported withgrpcio < 1.83.0.In October 2026, Google Cloud client libraries (including
google-auth) will raise minimum requirements to enforcegrpcio >= 1.83.0for Post-Quantum Cryptography (PQC) support.Towards: b/537446703