chore(deps): update google.protobuf to v3.25.6

[solrbot]

This PR contains the following updates:

Package	Type	Update	Change
com.google.protobuf:protobuf-java-util (source)	dependencies	patch	3.25.3 -> 3.25.6
com.google.protobuf:protobuf-java (source)	dependencies	patch	3.25.3 -> 3.25.6

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[malliaridis]

branch_9x does not explicitly specify a google protobuf version and therefore this update cannot be backported without adding explicitly the version to versions.props.

Besides that, this update should be safe to merge in main.