chore(main): release opentelemetry-instrumentation-koala 0.21.0

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🤖 I have created a release beep boop

0.21.0 (2024-02-27)

⚠ BREAKING CHANGES

• Drop support for EoL Ruby 2.7 (#389)
• Remove parent repo libraries (#3)

Features

• Drop support for EoL Ruby 2.7 (#389) (233dfd0)

Bug Fixes

• Base config options (#499) (7304e86)
• broken test file requirements (#1286) (3ec7d8a)
• regex non-match with obfuscation limit (issue #486) (#488) (6a9c330)

Code Refactoring

• Remove parent repo libraries (#3) (3e85d44)

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