build(deps): bump scipp from 23.12.0 to 24.2.0 in /requirements

Bumps [scipp](https://github.com/scipp/scipp) from 23.12.0 to 24.2.0.
- [Release notes](https://github.com/scipp/scipp/releases)
- [Commits](scipp/scipp@23.12.0...24.02.0)

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -125,7 +125,7 @@ requests==2.31.0
     # via pooch
 sciline==24.1.1
     # via -r base.in
-scipp==23.12.0
+scipp==24.2.0
     # via
     #   -r base.in
     #   scippneutron