deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v3.12.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-shared-dependencies	3.11.0 -> 3.12.0

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[zhumin8]

error stack-trace

Error:  Require upper bound dependencies error for com.google.j2objc:j2objc-annotations:1.3 paths to dependency are:
Error:  +-com.google.cloud:google-cloud-spanner:6.43.1-SNAPSHOT
Error:    +-com.google.protobuf:protobuf-java-util:3.23.2
Error:      +-com.google.j2objc:j2objc-annotations:1.3
Error:  and
Error:  +-com.google.cloud:google-cloud-spanner:6.43.1-SNAPSHOT
Error:    +-com.google.api.grpc:grpc-google-common-protos:2.21.0
Error:      +-com.google.j2objc:j2objc-annotations:2.8
Error:  and
Error:  +-com.google.cloud:google-cloud-spanner:6.43.1-SNAPSHOT
Error:    +-com.google.http-client:google-http-client:1.43.3
Error:      +-com.google.j2objc:j2objc-annotations:2.8
Error:  and
Error:  +-com.google.cloud:google-cloud-spanner:6.43.1-SNAPSHOT
Error:    +-com.google.guava:guava:32.0.1-jre
Error:      +-com.google.j2objc:j2objc-annotations:2.8
Error:  ]
Error:  -> [Help 1]