THRIFT-6154: Drop Ruby 2.7 support

[kpumuk]

Ruby 2.7 was released on December 25, 2019 and reached end of life on March 31, 2023, but the Thrift Ruby gem still declares and tests Ruby 2.7 support.

This raises the gem's minimum Ruby version to 3.0 and aligns the language matrix, Ruby documentation, RuboCop target, build matrix, and static-analysis workflow. The pure-Ruby CI variant moves to the new minimum instead of being removed.

The updated lint target also exposes a few behavior-preserving idiomatic cleanups: direct collection mapping, an endless range for partial socket writes, removal of a redundant regexp freeze, and removal of obsolete gemspec boilerplate.

This is a breaking support-policy change. Applications still running Ruby 2.7 must remain on an earlier Thrift gem until they upgrade Ruby.

• Did you create an Apache Jira ticket? (THRIFT-6154)
• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?
• Did you squash your changes to a single commit? (not required, but preferred)
• Did you do your best to avoid breaking changes? If one was needed, did you label the Jira ticket with "Breaking-Change"?
• If your change does not involve any code, include [skip ci] anywhere in the commit message to free up build resources.

[Copilot]

Pull request overview

This PR updates the Apache Thrift Ruby library and CI configuration to drop Ruby 2.7 support (EOL) and set Ruby 3.0 as the minimum supported Ruby version, aligning documentation, linting, and GitHub Actions matrices accordingly.

Changes:

• Raise the Ruby gem minimum required Ruby from >= 2.7.0 to >= 3.0.0.
• Update Ruby-facing documentation and repo support-matrix references to Ruby 3.0+.
• Update RuboCop and GitHub Actions workflows to remove Ruby 2.7 and use Ruby 3.0 for the minimum/pure-Ruby CI variant; includes small Ruby 3.0+ idiomatic cleanups.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/rb/thrift.gemspec	Bumps required_ruby_version to >= 3.0.0 and removes obsolete gemspec boilerplate.
lib/rb/README.md	Updates documented Ruby compatibility/requirements to Ruby 3.0+.
lib/rb/lib/thrift/uuid.rb	Removes redundant regexp .freeze under the new Ruby baseline.
lib/rb/lib/thrift/transport/socket.rb	Uses Ruby 3.0+ endless range slicing in partial-write loop.
lib/rb/lib/thrift/struct_union.rb	Uses map for collection formatting (behavior-preserving cleanup).
lib/rb/.rubocop.yml	Raises RuboCop TargetRubyVersion to 3.0.
LANGUAGES.md	Updates Ruby language-level entry to reflect the new supported baseline.
.github/workflows/sca.yml	Runs Ruby SCA job on Ruby 3.0 instead of 2.7.
.github/workflows/build.yml	Removes Ruby 2.7 from the Ruby CI matrix and moves the no-extension job to Ruby 3.0.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.