Prepare RubyGems 4.0.16 and Bundler 4.0.16

[hsbt]

• Reuse RubyGems' vendored tsort in Bundler #9647
• Point Bundler gemspec metadata at the moved docs #9648
• Pin rdoc below 8 on JRuby in install CI #9656
• bundler: Fix Bundler::Fetcher for PQC support, adding integration connection tests #9637
• Fix the gemspec error snippet on Windows drive-letter paths #9668
• Preserve CRLF lockfile line endings on Windows #9669
• Initialize the new gem's git repo without a subshell #9670
• Skip the make job server when using BSD make #9676
• Disable git background maintenance in bundler specs #9681

[Copilot]

Pull request overview

Prepares the RubyGems/Bundler 4.0.16 release by bumping versions and lockfiles, updating changelogs, and forward-porting multiple fixes across Bundler, RubyGems tests, and CI (Windows path/CRLF correctness, PQC SSL client cert support, BSD make jobserver handling, and spec harness stability).

Changes:

• Bump RubyGems/Bundler versions to 4.0.16 and refresh associated lockfiles/fixtures/changelogs.
• Deduplicate Bundler’s tsort vendor usage to RubyGems’ Gem::TSort, and extend SSL client cert handling to support non-RSA keys (PQC).
• Adjust CI/spec harness for newer tooling (JRuby rdoc pin, Git maintenance disablement), plus platform fixes (Windows, BSD make).

Reviewed changes

Copilot reviewed 26 out of 35 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tool/bundler/vendor_gems.rb.lock	Update Bundler lock “BUNDLED WITH” to 4.0.16.
tool/bundler/test_gems.rb.lock	Update Bundler lock “BUNDLED WITH” to 4.0.16.
tool/bundler/standard_gems.rb.lock	Update Bundler lock “BUNDLED WITH” to 4.0.16.
tool/bundler/rubocop_gems.rb.lock	Update Bundler lock “BUNDLED WITH” to 4.0.16.
tool/bundler/release_gems.rb.lock	Update Bundler lock “BUNDLED WITH” to 4.0.16.
tool/bundler/lint_gems.rb.lock	Update Bundler lock “BUNDLED WITH” to 4.0.16.
tool/bundler/dev_gems.rb.lock	Update Bundler lock “BUNDLED WITH” to 4.0.16.
tool/automatiek/vendor.rb	Remove Bundler’s vendored tsort from Automatiek vendored gem list.
test/rubygems/test_gem_remote_fetcher_local_ssl_server.rb	Refactor to shared SSL server utilities and update cert path usage; PQC skip logic delegates to utility helper.
test/rubygems/local_ssl_server_utilities.rb	New shared helper for local SSL server + PQC capability probing for both RubyGems (test-unit) and Bundler (rspec).
Manifest.txt	Remove Bundler’s vendored tsort files from manifest.
lib/rubygems.rb	Bump RubyGems version to 4.0.16.
CHANGELOG.md	Add RubyGems 4.0.16 entry.
bundler/spec/support/windows_tag_group.rb	Add new local SSL server fetcher spec to Windows tag grouping.
bundler/spec/support/path.rb	Add helper path accessor for test/rubygems to load shared test utilities from Bundler specs.
bundler/spec/support/artifice/helpers/artifice.rb	Fix Artifice activation/deactivation to reliably restore the original Gem::Net::HTTP.
bundler/spec/spec_helper.rb	Disable Git background maintenance in spec environment to reduce flakiness.
bundler/spec/runtime/setup_spec.rb	Remove Windows skip for gemspec LoadError snippet test.
bundler/spec/realworld/fixtures/warbler/Gemfile.lock	Update fixture lock “BUNDLED WITH” to 4.0.16.
bundler/spec/realworld/fixtures/tapioca/Gemfile.lock	Update fixture lock “BUNDLED WITH” to 4.0.16.
bundler/spec/lock/lockfile_spec.rb	Enable Windows CRLF lockfile preservation spec; use binary read for line ending assertions.
bundler/spec/commands/newgem_spec.rb	Remove Windows skip for bundle gem git init path-with-spaces spec.
bundler/spec/bundler/installer/parallel_installer_spec.rb	Ensure Artifice is activated where needed and add coverage for BSD make jobserver behavior.
bundler/spec/bundler/fetcher/gem_remote_fetcher_local_ssl_server_spec.rb	New integration spec for local SSL server connections including PQC client cert auth.
bundler/spec/bundler/fetcher_spec.rb	Update expectations to match OpenSSL::PKey.read behavior for client cert key loading.
bundler/lib/bundler/version.rb	Bump Bundler version to 4.0.16.
bundler/lib/bundler/vendored_tsort.rb	Switch Bundler tsort shim to rubygems/vendored_tsort with stdlib fallback.
bundler/lib/bundler/spec_set.rb	Use Gem::TSort and rescue Gem::TSort::Cyclic to align with RubyGems vendor namespace.
bundler/lib/bundler/installer/parallel_installer.rb	Skip make jobserver when BSD make is in use (unless explicitly using gmake).
bundler/lib/bundler/fetcher.rb	Load SSL client key via OpenSSL::PKey.read to support non-RSA (e.g., PQC) keys.
bundler/lib/bundler/dsl.rb	Fix backtrace line number parsing to handle Windows drive-letter paths.
bundler/lib/bundler/definition.rb	Preserve CRLF lockfile endings on Windows by checking raw bytes on disk and converting after equality check.
bundler/lib/bundler/cli/gem.rb	Initialize git repo without invoking a shell (Windows-safe) by spawning git with argv.
bundler/CHANGELOG.md	Add Bundler 4.0.16 entry covering the included fixes/backports.
.github/workflows/install-rubygems.yml	Pin rdoc <8 on JRuby in install CI to avoid native-extension dependency issues.

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