Fix ci build without code changes

[gabsow]

Fix CI failures by installing necessary Rust toolchain, build dependencies, and OpenSSL on Linux and macOS, and allow unstable Redis matrix to continue on error.

The CI was failing due to missing build tools, Rust toolchain components, and specific library dependencies (like OpenSSL) in the GitHub Actions environment, despite the code building successfully locally. These changes ensure the CI environment has all prerequisites.

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Note

Update CI workflows to install required Rust and system dependencies on Linux/macOS and mark the Redis 'unstable' matrix as continue-on-error.

• CI (GitHub Actions):
  • Matrix behavior: Set continue-on-error when redis_version is unstable for both linux.yml and macos.yml.
  • Rust setup: Install stable Rust toolchain with clippy and rustfmt on both platforms.
  • Linux (.github/workflows/linux.yml):
    • Install build prerequisites: build-essential, autoconf, automake, libtool, pkg-config, libssl-dev.
  • macOS (.github/workflows/macos.yml):
    • Expand Homebrew installs to include pkg-config and openssl@3; run brew update.
    • Export OPENSSL_PREFIX via $GITHUB_ENV.

^{Written by Cursor Bugbot for commit f20c603. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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