Improve mypy gh action (#79)

* improve mypy gh action

* don't filter by file change for sake of consistency

* specify python version to avoid warning

* upgrade setup-python action to latest

.github/workflows/mypy.yml

@@ -1,27 +1,21 @@
-name: Lint
+name: mypy
 
-on:
-  pull_request:
-  push:
-    paths:
-      - '*.py'
+on: [push, pull_request]
 
 jobs:
   mypy:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
-          python-version: "3.10"
-          architecture: x64
-      - name: Checkout
-        uses: actions/checkout@v3
+          python-version: '3.x'
       - name: Install mypy
-        run: pip install mypy
+        run: |
+            python -m pip install --upgrade pip
+            pip install mypy
       - name: Run mypy
         uses: sasanquaneuf/mypy-github-action@releases/v1
         with:
           checkName: 'mypy'   # NOTE: this needs to be the same as the job name
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}