build(deps): bump scipp from 24.8.0 to 24.9.1 in /requirements

Bumps [scipp](https://github.com/scipp/scipp) from 24.8.0 to 24.9.1.
- [Release notes](https://github.com/scipp/scipp/releases)
- [Commits](scipp/scipp@24.08.0...24.09.1)

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -115,7 +115,7 @@ pyyaml==6.0.2
     #   orsopy
 sciline==24.6.2
     # via -r base.in
-scipp==24.8.0
+scipp==24.9.1
     # via
     #   -r base.in
     #   essreduce