Bump fsspec from 2023.9.2 to 2023.12.1 in /.github/dependabot

Bumps [fsspec](https://github.com/fsspec/filesystem_spec) from 2023.9.2 to 2023.12.1.
- [Commits](fsspec/filesystem_spec@2023.9.2...2023.12.1)

---
updated-dependencies:
- dependency-name: fsspec
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/dependabot/constraints.txt

@@ -1,2 +1,2 @@
-fsspec==2023.9.2
+fsspec==2023.12.1
 pyslk==1.4.1