Bump filelock in /serverless-fleets/tutorials/inferencing/src

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.18.0 to 3.20.3.
- [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...3.20.3)

---
updated-dependencies:
- dependency-name: filelock
  dependency-version: 3.20.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

serverless-fleets/tutorials/inferencing/src/requirements.txt

@@ -1,7 +1,7 @@
 accelerate==1.6.0
 certifi==2025.4.26
 charset-normalizer==3.4.2
-filelock==3.18.0
+filelock==3.20.3
 fsspec==2025.3.2
 hf-xet==1.1.0
 huggingface-hub==0.31.1