Bump fsspec from 2024.12.0 to 2025.3.0 in /backend

Bumps [fsspec](https://github.com/fsspec/filesystem_spec) from 2024.12.0 to 2025.3.0.
- [Commits](fsspec/filesystem_spec@2024.12.0...2025.3.0)

---
updated-dependencies:
- dependency-name: fsspec
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]