Update pixi lockfile

Author: amacati

.github/workflows/testing.yml

@@ -8,9 +8,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup Pixi (installs pixi + caches envs) # https://github.com/marketplace/actions/setup-pixi
-        uses: prefix-dev/[email protected].0            # pin the action version
+        uses: prefix-dev/[email protected].3            # pin the action version
         with:
-          pixi-version: v0.49.0                       # pin the pixi binary version (optional)
+          pixi-version: v0.61.0                       # pin the pixi binary version (optional)
           cache: true                                 # enable caching of installed envs
           # only write new caches on main pushes (optional)
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}