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

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.20.3 to 4.2.1.
- [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@3.20.3...4.2.1)

---
updated-dependencies:
- dependency-name: filelock
  dependency-version: 4.2.1
  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==2026.10.19
 charset-normalizer==3.4.2
-filelock==3.20.3
+filelock==4.2.1
 fsspec==2026.6.0
 hf-xet==1.1.0
 huggingface-hub==0.31.1