Bump fsspec from 2026.4.0 to 2026.6.0

Bumps [fsspec](https://github.com/fsspec/filesystem_spec) from 2026.4.0 to 2026.6.0.
- [Commits](fsspec/filesystem_spec@2026.4.0...2026.6.0)

---
updated-dependencies:
- dependency-name: fsspec
  dependency-version: 2026.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -87,7 +87,7 @@ fastjsonschema==2.21.2
     # via nbformat
 fonttools==4.63.0
     # via matplotlib
-fsspec==2026.4.0
+fsspec==2026.6.0
     # via dask
 furo==2025.12.19
     # via qcodes (pyproject.toml)