Support checksum validation when updating Maven wrappers

[rarkins]

Discussed in #33227

^{Originally posted by clayburn December 20, 2024}

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Renovate does not properly apply Maven wrapper updates when the Maven wrapper is configured to use checksum verification. There are two cases in which Renovate breaks:

• PRs to update the Maven distribution will not update the checksum of the Maven distribution. See here for an example.
• PRs to update the Maven wrapper will remove the checksums for both the Maven wrapper and the distribution, disabling checksum verification. See here for an example.

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Reproduction forked to https://github.com/renovate-reproductions/33227