Bump cgrep version to 9.2.3

Bump version to 9.2.2

Introduce --tests-only/--no-tests and bump 9.2.1

Update README and usage examples to reflect the new flags.
Implement parsing logic in CmdOptions and bump the cabal version.
Remove a stray Debug.Trace import and apply minor whitespace fixes.

Bump README to 9.2.0 and update counts

Update version strings in header, "What's New" section, and usage
example. Increment reported supported languages for semantic test
filtering and test-framework support from 27+ to 28+.

Rewrite README for v9.0.0 release

Release Cgrep 8.2.0

- Replaced RawFilePath with OsPath.
- Fixed a bug in the generic tokenizer and parser affecting several languages (e.g., C++, Rust).
- Improved code quality and resolved minor issues.

Readme updated.

v8.1.2: LTS updated to tls-21.20.

v8.1.0 released.