feat!: node.js 26 support

[dianager]

Pre-Submission Checklist

• Opened an issue discussing these changes before opening the PR
• Ran the linter and tests via make prepush
• Included comprehensive and convincing tests for changes

Issues

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Summary

This PR updates restify for Node.js 26 support and modernizes deprecated Node.js APIs and dependencies. It raises the supported runtime baseline to Node.js 22+, updates CI to test Node.js 22/24/26, removes deprecated SPDY support, and replaces legacy URL/request APIs with modern platform APIs.

Changes

Node.js 26 support

• Raise engines.node from >=10.0.0 to >=22.0.0.
• Update README supported versions to Node.js 22.x, 24.x, and 26.x.
• Update CI test matrix from Node.js 14/16/18/20 to 22/24/26.
• Update GitHub Actions versions used in CI.

Removed deprecated SPDY support

• Remove the spdy dependency.
• Remove SPDY server option documentation.
• Remove SPDY example and test certificate fixtures.

Deprecated Node.js API replacements

• Replace request.connection usage with request.socket.
• Replace deprecated request.abort() usage with request.destroy().
• Replace deprecated new Buffer() / Buffer() usage.
• Replace module.parent checks in benchmarks/test helpers with require.main === module.
• Replace uuid dependency usage with crypto.randomUUID().

URL API modernization

• Replace deprecated url.resolve() and url.parse() paths with WHATWG URL.
• Update req.getUrl() to return/cache a URL instance.
• Preserve correct raw query behavior via req.getQuery().
• Update redirect URL construction to use URL / URLSearchParams.
• Preserve duplicate query parameters during redirects.
• Improve handling for relative redirects, explicit host/port redirects, and OPTIONS *.

Dependency updates

• Upgrade find-my-way to ^9.6.0.
• Upgrade qs to ^6.15.2.
• Upgrade send to ^1.2.1.
• Upgrade inquirer to ^8.2.7.
• Remove production dependency on uuid.

Query/body parsing

• Add arrayLimit option support for URL-encoded body parsing.
• Add throwOnLimitExceeded support for query parsing and URL-encoded body parsing.
• Surface qs limit errors as InvalidContentError.

Routing

• Add useSemicolonDelimiter option to preserve optional semicolon-delimited path segment behavior with newer find-my-way.
• Add router tests for matrix parameter behavior with and without useSemicolonDelimiter.

Tests and docs

• Update tests for Node.js 26 behavior and modern URL APIs.
• Add coverage for req.getUrl(), req.absoluteUri(), redirects, duplicate query params, OPTIONS *, and semicolon-delimited routing.
• Fix benchmark tests by calling next() from handlers.
• Regenerate API documentation for updated options and behavior.

Breaking Changes

• Drops support for Node.js versions below 22.
• Removes deprecated SPDY support and the spdy dependency.
• Updates routing behavior dependencies through find-my-way@9; semicolon-delimited path segment stripping now requires useSemicolonDelimiter: true.
• Updates query/body parsing behavior through qs@6.15.2, including optional limit-error behavior.

Validation

• CI matrix updated to Node.js 22.x, 24.x, and 26.x.
• Test coverage updated for request URL parsing, redirect behavior, query/body parser limits, routing semicolon handling, and deprecated API replacements.