chore(deps): bump filelock from 3.19.1 to 3.20.1 in /backend

[dependabot]

Bumps filelock from 3.19.1 to 3.20.1.

Release notes

Sourced from filelock's releases.

3.20.1

What's Changed

• CVE-2025-68146: Fix TOCTOU symlink vulnerability in lock file creation by @​gaborbernat in tox-dev/filelock#461

Full Changelog: tox-dev/filelock@3.20.0...3.20.1

3.20.0

What's Changed

• Add tox.toml to sdist by @​mtelka in tox-dev/filelock#436
• Update docs with example by @​znichollscr in tox-dev/filelock#438
• Add 3.14 support and drop 3.9 by @​gaborbernat in tox-dev/filelock#448

New Contributors

• @​mtelka made their first contribution in tox-dev/filelock#436
• @​znichollscr made their first contribution in tox-dev/filelock#438

Full Changelog: tox-dev/filelock@3.19.1...3.20.0

Commits

• 377f622 [pre-commit.ci] pre-commit autoupdate (#460)
• 4724d7f Fix TOCTOU symlink vulnerability in lock file creation (#461)
• cb69414 Bump actions/upload-artifact from 5 to 6 (#459)
• 0769294 Bump actions/download-artifact from 6 to 7 (#458)
• 414193a [pre-commit.ci] pre-commit autoupdate (#457)
• 1456797 [pre-commit.ci] pre-commit autoupdate (#456)
• 8d6bf90 Bump actions/checkout from 5 to 6 (#455)
• f7edeeb [pre-commit.ci] pre-commit autoupdate (#454)
• fb09235 [pre-commit.ci] pre-commit autoupdate (#453)
• f5825d8 [pre-commit.ci] pre-commit autoupdate (#452)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #49.