feat: release version 4.1.9 with version string cleanup

[gibiw]

• Updated version to 4.1.9 in pyproject.toml.
• Removed 'v' prefix from version strings in ApiV2Client for cleaner output.
• Ensured consistent formatting of version information in host data retrieval.

This release enhances the clarity of version information in API responses.

---

Note

Bumps to 4.1.9 and removes the 'v' prefix from X-Client version fields in ApiV2Client.

• Versioning:
  • Bump qase-python-commons to 4.1.9 in pyproject.toml.
• Client headers (src/qase/commons/client/api_v2_client.py):
  • Normalize X-Client header values by removing v prefix from reporter_version, client_version_v1, client_version_v2, and core_version.

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