fix(manager/haskell-cabal): Handle comments in Cabal file

[ysangkok]

Changes

The Haskell Cabal file parser doesn't handle comments.

This is an issue, since files are parsed incorrectly, and generated patches are invalid.

I simply forgot to implement this, and there were no comments inside the build-depends section in the Cabal regression suite corpus.

Before this PR, an unindented comment would be able to terminate the block, which is incorrect.

Before this PR, commas within the comments would be used to split the dependency listing, which is also incorrect.

After this PR, those issues are resolved.

Context

• See this Renovate-generated commit, where a dependency is interpreted as including a following line, all the way up to it's final comma.

  • chore(deps): update dependency warp to v3.4 (main) PostgREST/postgrest#3861

• Issue reported by @wolfgangwalther in

  • feat(manager): add Cabal/Haskell manager using Hackage/PVP #33142 (comment)

Documentation (please check one with an [x])

• I have updated the documentation, or
• 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

[renovate-release]

🎉 This PR is included in version 39.117.3 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 39.117.3

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