chore: add mypy as dependency

Author: mariuswinger

.github/workflows/linting-and-checks.yaml

@@ -43,19 +43,20 @@ jobs:
       - name: "Setup: checkout repository"
         uses: actions/checkout@v4
 
+      - name: "Setup: install poetry"
+        run: pipx install poetry
+
       - name: "Setup: add python"
         uses: actions/setup-python@v5
         with:
           python-version: "3.12"
+          cache: "poetry"
 
-      - name: "Setup: add venv"
-        run: |
-          pip install poetry
-          poetry config virtualenvs.in-project true
-          poetry install
+      - name: "Setup: install dependencies"
+        run: poetry install
 
       - name: "Run: mypy"
-        run: mypy src
+        run: poetry run mypy src
 
   typescript-compile:
     runs-on: ubuntu-latest