Update beam.version to v2.71.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.beam:beam-sdks-java-extensions-protobuf (source)	2.48.0 → 2.71.0
org.apache.beam:beam-runners-direct-java (source)	2.48.0 → 2.71.0
org.apache.beam:beam-sdks-java-core (source)	2.48.0 → 2.71.0

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