ci: Use sparse-checkout for prepare-cache job

Author: nikobockerman

.github/workflows/mise-uv-prepare-cache.yaml

@@ -18,6 +18,11 @@ jobs:
           echo "UV_CACHE_DIR=${RUNNER_TEMP}/uv-cache" >> "$GITHUB_OUTPUT"
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          sparse-checkout: |
+            mise.toml
+            pyproject.toml
+            uv.lock
       - name: Setup mise
         uses: nikobockerman/github-actions/.github/actions/mise-project-setup@b12caab198959ecff4dac98df90e3af675e30570
       - name: uv cache