Bump filelock from 3.0.12 to 3.20.1

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.0.12 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@v3.0.12...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]

requirements.txt

@@ -4,7 +4,7 @@ cov-core==1.15.0
 coverage==5.5
 distlib==0.3.1
 execnet==1.8.0
-filelock==3.0.12
+filelock==3.20.1
 iniconfig==1.1.1
 py==1.10.0
 pytest-cov==2.11.1