fix(sdk): Updates to proto version v0.42.0

[github-actions]

This PR updates the platform.branch property in all pom.xml files to the new tag or branch: v0.42.0.

See the release: https://github.com/opentdf/platform/releases/tag/protocol%2Fgo%2Fv0.42.0

Release Notes:

0.42.0 (2026-10-14)

Bug Fixes

• authz: scope uncached decisions to requested attribute policy (#4192) (15aa0cc)
• deps: bump google.golang.org/grpc from 1.83.0 to 1.83.1 in /protocol/go (#3958) (7270831)
• deps: bump google.golang.org/grpc from 1.83.1 to 1.83.2 in /protocol/go (#4015) (6b581f3)

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