chore(deps): Update `play-googleauth` to v4.0.0

[akash1810]

What does this change?

This fixes an issue with the locale field in Google's response during the login process.

See https://github.com/guardian/play-googleauth/pull/218.

play-secret-rotation is also updated to v7.1.0 due to binary compatibility:

[error] stack trace is suppressed; run last riffraff / update for the full output
[error] (riffraff / update) found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[error] 
[error]         * com.gu.play-secret-rotation:core_2.13:7.1.0 (early-semver) is selected over {6.0.8}
[error]             +- com.gu.play-googleauth:play-v30_2.13:4.0.0         (depends on 7.1.0)
[error]             +- com.gu.play-secret-rotation:play-v30_2.13:6.0.8    (depends on 6.0.8)
[error]             +- com.gu.play-secret-rotation:aws-parameterstore-secret-supplier-base_2.13:6.0.8 (depends on 6.0.8)
[error] 
[error] 
[error] this can be overridden using libraryDependencySchemes or evictionErrorLevel
[error] Total time: 0 s, completed 15 Mar 2024, 10:28:40

How can we measure success?

More reliable login experience.

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From guardian/actions-riff-raff.

[akash1810]

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