Fix v1 stdlib lint not firing for double-quoted compiler() calls

[pb01ka]

Checklist

• Added a news entry with any new deprecations added to the Deprecated section.
• Regenerated schema JSON if schema altered (python -m conda_smithy.schema)
• Regenerated linter documentation if any rules were added, removed or modified (python -m conda_smithy.linter.messages)

Fixes #2572

Problem

The lint_stdlib check is supposed to flag a v1 recipe that uses a compiler (e.g. ${{ compiler("c") }}) without also declaring the matching C stdlib (${{ stdlib("c") }}). It detects compiler usage via the pat_compiler_stub regex, which for v1 recipes was:

r"^\${{ compiler\('(m2w64_)?(c|cxx|fortran|rust|go-cgo)"

This only matches a single-quoted argument (compiler('c')). Recipes that use double quotes (compiler("c")) - a perfectly valid and common style, e.g. openimageio-feedstock#138 - were never detected as using a compiler at all, so the stdlib check was silently skipped. This let a recipe merge without ${{ stdlib("c") }}, which in turn caused openimageio-feedstock#150.

The sibling stdlib_regex a few lines below already handled both quote styles (['\"]) - the compiler-detection regex was just never updated to match.

Fix

Update pat_compiler_stub to accept either quote character:

r"^\${{ compiler\(['\"](m2w64_)?(c|cxx|fortran|rust|go-cgo)"

Testing

Parametrized test_v1_stdlib_hint over both ' and " quote styles. Confirmed the new double-quote cases fail against the old regex and pass with the fix; the full stdlib/compiler test suite (29 tests) passes.

In addition to this the recipe from openimageio-feedstock#138 now fails with this PR (which is the expectation),

(py313) 1:58:21:~/conda-smithy % conda smithy recipe-lint ../recipe-dir
../recipe-dir has some lint:
  This recipe is using a compiler, which now requires adding a build dependence on `${{ stdlib("c") }}` as well. Note that this rule applies to each output of the recipe using a compiler. For further details, please see https://github.com/conda-forge/conda-forge.github.io/issues/2102.

[h-vetinari]

Thank you!