Merge pull request #617 from scipp/dependabot/pip/requirements/scipp-25.4.0

Bump scipp from 25.3.0 to 25.4.0 in /requirements

Author: MridulS

requirements/base.txt

@@ -63,7 +63,7 @@ python-dateutil==2.9.0.post0
     #   -r base.in
     #   matplotlib
     #   scippnexus
-scipp==25.3.0
+scipp==25.4.0
     # via
     #   -r base.in
     #   scippnexus