fix(manager/gradle): normalize version aliases in version catalogs

[Churro]

Changes

Fixes a regression introduced with #21820 by ensuring that all lookups of version refs (aliases) are performed on their normalized alias representations.

The regression happened because version.ref expected version aliases to occur with -, instead of . or _. Since the corresponding version aliases themselves were not normalized, aliases with underscores could no longer be matched.

The normalization scheme is aligned to the one used by Gradle. There was nothing wrong with replacing _ by - but since gradle replaces them by . it seems reasonable to stay consistent with gradle here.

Context

• Closes Renovate stopped updating Java dependencies when using underscore in Gradle TOML version.ref #22365

Some extra notes for occasional future reference:

• For inline version catalogs and catalogs in TOML files, Gradle normalizes aliases in version catalogs (here)
• The corresponding AliasNormalizer was introduced with gradle/gradle@a17338d and is used when building or accessing aliases in version catalogs (e.g. here).
• The TomlCatalogFileParser itself does no normalization.

Documentation (please check one with an [x])

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• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

Test repo: renovate-demo/22365#2

[renovate-release]

🎉 This PR is included in version 35.104.0 🎉

The release is available on:

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• 35.104.0

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