fix: update pathspec to 1.0.0 and add librt to resolve ClusterFuzzLite failure (fixes #2167)

[Adarshkumar0509]

Resolved or fixed issue: #2167

Problem

• Two issues were causing ClusterFuzzLite to fail:
  pathspec==0.12.1 conflicts with mypy==1.20.0 which requires pathspec>=1.0.0
  mypy==1.20.0 requires librt>=0.8.0 which was not pinned with a hash in --require-hashes mode
  The fuzzer capec_map_enricher_fuzzer.py was crashing because enricher.main() calls sys.exit(1) on failure, which atheris treats as a crash signal — SystemExit was not being caught

Changes

• Updated pathspec from 0.12.1 to 1.0.0 with correct hash
• Added librt==0.9.0 with correct hash for Linux cp311
• Refactored capec_map_enricher_fuzzer.py to properly catch SystemExit in _run_enricher_main, preventing atheris from treating expected script exits as crashes

Testing

• Verified locally with oss-fuzz Docker — all 3 fuzzers built successfully
• Black and flake8 pass with no errors
• Fuzzer complexity ≤ 10 per function

AI Tool Disclosure

AI Usage
Used AI assistance for understanding the approach all the things done manually. No AI-generated noise or unnecessary comments are present.

Affirmation

• My code follows the CONTRIBUTING.md guidelines

[Adarshkumar0509]

hii @sydseter sir,can you take a look at this?

[sydseter]

@Adarshkumar0509 Thank you. That‘s great!