Use github action that caches LFS files when checking out the repo (#647)

Uses https://github.com/nschloe/action-cached-lfs-checkout where we're using git-lfs.

This is a wrapper around `actions/checkout@v3` which uses `actions/cache@v3` to cache the files on LFS to avoid downloading them every time and spare LFS bandwidth.

.github/workflows/tests.yml

@@ -22,12 +22,11 @@ jobs:
       cancel-in-progress: true
     steps:
       - name: ⏬ Checkout with LFS
-        uses: actions/checkout@v3
+        uses: nschloe/action-cached-lfs-checkout@v1.2.1
         with:
           # Ensure we are building the branch and not the branch after being merged on develop
           # https://github.com/actions/checkout/issues/881
           ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.ref }}
-          lfs: 'true'
       - name: ☕️ Use JDK 17
         uses: actions/setup-java@v3
         with: