Bump filelock from 3.18.0 to 3.20.0

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.18.0 to 3.20.0.
- [Release notes](https://github.com/tox-dev/py-filelock/releases)
- [Changelog](https://github.com/tox-dev/filelock/blob/main/docs/changelog.rst)
- [Commits](tox-dev/filelock@3.18.0...3.20.0)

---
updated-dependencies:
- dependency-name: filelock
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -28,7 +28,7 @@ dynamic = ["version"]
 [project.optional-dependencies]
 test = [
     "black==25.1.0",
-    "filelock==3.18.0",
+    "filelock==3.20.0",
     "flake8==7.3.0",
     "pyright==1.1.402",
     "pytest==8.4.1",