[DEVOPS-584] pixi install --locked instead of --frozen

so that it fails in case the lock file is not up-to-date with the pyproject.toml

Author: sebhmg

.github/actions/reusable-python-setup_pixi/action.yml

@@ -29,6 +29,6 @@ runs:
       with:
         pixi-version: v0.54.1
         cache: true
-        frozen: true
+        locked: true
       env:
         GIT_LFS_SKIP_SMUDGE: 1

.github/workflows/reusable-python-build_pixi_package.yml

@@ -94,7 +94,7 @@ jobs:
                 with:
                     pixi-version: v0.54.1
                     cache: false
-                    frozen: true
+                    locked: true
             -   name: Hatch build
                 run: pixi run hatch build