build(deps): bump scipp from 23.11.1 to 23.12.0 in /requirements

Bumps [scipp](https://github.com/scipp/scipp) from 23.11.1 to 23.12.0.
- [Release notes](https://github.com/scipp/scipp/releases)
- [Commits](scipp/scipp@23.11.1...23.12.0)

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

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

requirements/base.txt

@@ -34,9 +34,7 @@ fonttools==4.43.1
 fsspec==2023.10.0
  # via dask
 graphlib-backport==1.0.3
- # via
- # sciline
- # scipp
+ # via sciline
 graphviz==0.20.1
  # via -r base.in
 h5py==3.10.0
@@ -124,7 +122,7 @@ requests==2.31.0
  # via pooch
 sciline==23.9.1
  # via -r base.in
-scipp==23.11.1
+scipp==23.12.0
  # via
  # -r base.in
  # scippneutron