Build(deps): Bump pysigma from 0.11.17 to 0.11.18

Bumps [pysigma](https://github.com/SigmaHQ/pySigma) from 0.11.17 to 0.11.18.
- [Release notes](https://github.com/SigmaHQ/pySigma/releases)
- [Commits](SigmaHQ/pySigma@v0.11.17...v0.11.18)

---
updated-dependencies:
- dependency-name: pysigma
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>