Relax `PyYAML` dependency version requirement...

[busticated]

Describe the bug
Currently, CodeChecker wants PyYAML==6.0.1 (source). This prevents me from installing other packages which want a newer but non-breaking version (example). NOTE: PyYAML v6.0.1 appears to have been released back in July 2023 (info) and v6.0.3 in September 2025 (info)

CodeChecker version
v6.26.2 with our PyProject file specifying codechecker~=6.26.2

To Reproduce
Steps to reproduce the behaviour:

1. with codechecker installed into your project at version 6.26.2...
2. using uv (docs), Install the poethepoet dependency or any dependency which uses a more recent version of pyyaml:
   • uv add --group dev "poethepoet>=0.38.0"

Expected behaviour
dependency is installed without issue

Actual behavior
dependency fails to install due to conflicts with the pyyaml version ranges:

× No solution found when resolving dependencies for split (markers:
  │ python_full_version == '3.13.3' and sys_platform == 'darwin'):
  ╰─▶ Because only poethepoet<=0.38.0 is available and poethepoet==0.38.0
      depends on pyyaml>=6.0.3, we can conclude that poethepoet>=0.38.0
      depends on pyyaml>=6.0.3.
      And because my-project:dev depends on poethepoet>=0.38.0 and my-project depends
      on pyyaml==6.0.1, we can conclude that my-project and my-project:dev are
      incompatible.
      And because your workspace requires my-project and my-project:dev, we can conclude
      that your workspace's requirements are unsatisfiable.
  help: If you want to add the package regardless of the failed resolution,
        provide the `--frozen` flag to skip locking and syncing.

Desktop (please complete the following information)

• OS: macos v15.7.2 (Sequoia)
• Browser: N/A
• Version: N/A

Additional context
Running latest uv - currently v0.9.10

[bruntib]

Dependency upgrades have been done in CodeChecker 6.27.2

• [refactor] Do not use pinned versions in requirements.txt #4714
• Upgrade deps #4751
  Please, let us know if further dependency conflicts occur.