chore: bump filelock in /haproxy-healthcheck/requirements

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.13.1 to 3.20.1.
- [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@3.13.1...3.20.1)

---
updated-dependencies:
- dependency-name: filelock
  dependency-version: 3.20.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

haproxy-healthcheck/requirements/test-freeze.txt

@@ -5,7 +5,7 @@
 anyio==4.1.0
 attrs==23.1.0
 certifi==2024.7.4
-filelock==3.13.1
+filelock==3.20.1
 h11==0.16.0
 httpcore==1.0.9
 httpx==0.25.2