Bump filelock from 3.7.0 to 3.20.1 in /requirements

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.7.0 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@3.7.0...3.20.1)

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -22,7 +22,7 @@ pulsar-galaxy-lib==0.14.13
 packaging==21.3
 miniwdl
 biopython==1.79
-filelock==3.7.0
+filelock==3.20.1
 cwlformat==2020.5.19
 cwl-utils==0.15
 graphviz