updater: support cmake FetchContent with enhanced robustness

[Copilot]

Adds support for updating CMake dependencies that use FetchContent_Declare syntax to the dependency updater system with enhanced robustness and performance optimizations.

The updater can now automatically parse and update CMake files containing:

FetchContent_Declare(
    sentry-native
    GIT_REPOSITORY https://github.com/getsentry/sentry-native
    GIT_TAG a64d5bd8ee130f2cda196b6fa7d9b65bfa6d32e2 # 0.9.1
    GIT_SHALLOW FALSE
    GIT_SUBMODULES "external/breakpad"
)

Features

• Automatic detection: Recognizes .cmake files, CMakeLists.txt, or any file containing FetchContent_Declare
• Repository extraction: Parses GIT_REPOSITORY to determine the dependency source
• Version handling: Extracts versions from GIT_TAG (supports both semantic versions and commit hashes)
• Format preservation: Maintains indentation, whitespace, and comments when updating
• Quoted value support: Handles both quoted ("v1.0.0") and unquoted (v1.0.0) GIT_TAG values while preserving original format
• Performance optimization: Efficient file detection that avoids unnecessary file reads for script files
• Error handling: Provides clear error messages for malformed or incomplete declarations

Usage

Add to your workflow:

cmake-dep:
  uses: getsentry/github-workflows/.github/workflows/updater.yml@v2
  with:
    path: cmake/dependencies.cmake
    name: CMake Dependency
  secrets:
    api-token: ${{ secrets.CI_DEPLOY_KEY }}

The implementation is fully backward compatible with existing dependency types (submodules, properties files, scripts) and includes comprehensive test coverage including edge cases for quoted values.

Fixes #91.

---

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[github-actions]

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🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- support cmake FetchContent with enhanced robustness ([#92](https://github.com/getsentry/github-workflows/pull/92))

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[vaind]

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[vaind]

@copilot address review comments from @seer-by-sentry