deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.95.1

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-spanner-bom	6.94.0 -> 6.95.1

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Release Notes

googleapis/java-spanner (com.google.cloud:google-cloud-spanner-bom)

v6.95.1

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Dependencies

• Update dependency com.google.cloud:sdk-platform-java-config to v3.49.0 (#​3909) (3de8502)
• Update googleapis/sdk-platform-java action to v2.59.0 (#​3910) (aed8bd6)

v6.95.0

Compare Source

Features

• Enable ALTS hard bound token in DirectPath (#​3904) (2b0f2ff)
• Enable grpc and afe metrics (#​3896) (706f794)
• Last statement sample (#​3830) (2f62816)
• spanner: Add new change_stream.proto (f385698)

Bug Fixes

• Directpath_enabled attribute (#​3897) (53bc510)

Dependencies

• Update dependency io.opentelemetry:opentelemetry-bom to v1.50.0 (#​3887) (94b879c)

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