Updated mantid dependency to 6.14 (#432)

* Updated mantid dependency to 6.14
* Fixed outdated deps and updated mantid in other locations
* Updated update lockfiles action to point to next branch

Author: dlcaballero16

.github/workflows/update-lockfiles.yml

@@ -34,7 +34,7 @@ jobs:
           title: Update pixi lockfile
           body-path: diff.md
           branch: update-pixi
-          base: main # change this to the default branch of your repository
+          base: next # change this to the default branch of your repository
           labels: pixi
           delete-branch: true
           add-paths: pixi.lock