Bump diskcache from 5.6.1 to 5.6.3

Bumps [diskcache](https://github.com/grantjenks/python-diskcache) from 5.6.1 to 5.6.3.
- [Commits](https://github.com/grantjenks/python-diskcache/compare/v5.6.1...v5.6.3)

---
updated-dependencies:
- dependency-name: diskcache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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