split mypy and lint from tests and run them only on linux/latest stable python

.github/workflows/python-package.yaml

@@ -26,7 +26,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -34,10 +34,40 @@ jobs:
       run: |
         make test
 
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3.x" 
+
     - name: Run linter
       run: |
         make lint
 
+  mypy:
+    name: mypy
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3.x" 
+
     - name: Run mypy
       run: |
         make mypy