Adds the typing and sets different suffixes for test matrix

.github/workflows/ci.yml

@@ -126,6 +126,7 @@ jobs:
         with:
           version: ${{ env.DEFAULT_UV_VERSION }}
           enable-cache: true
+          cache-suffix: "tests-${{ matrix.python-version }}"
       -
         name: Install system dependencies
         run: |
@@ -140,7 +141,7 @@ jobs:
         run: |
           uv sync \
             --python ${{ steps.setup-python.outputs.python-version }} \
-            --group test \
+            --group testing \
             --frozen
       -
         name: List installed Python dependencies
@@ -158,7 +159,7 @@ jobs:
           cd src/
           uv run \
             --python ${{ steps.setup-python.outputs.python-version }} \
-            --group test \
+            --group testing \
             --frozen \
             pytest -ra
       -