Update filelock requirement from <3.20,>=3.4 to >=3.19.1,<3.20

Updates the requirements on [filelock](https://github.com/tox-dev/py-filelock) to permit the latest version.
- [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@3.4.0...3.19.1)

---
updated-dependencies:
- dependency-name: filelock
  dependency-version: 3.19.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-tests.txt

@@ -7,4 +7,4 @@ pytest >= 6.2.0
 requests >= 2.25.1
 pytest-cov
 pytest-timeout
-filelock >= 3.4, < 3.20
+filelock >= 3.19.1, < 3.20