CI: update GitHub Actions and sundry tweaks

Author: dnicolodi

.github/workflows/checks.yml

@@ -17,15 +17,15 @@ jobs:
     env:
       FORCE_COLOR: true
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.7
 
-      - name: Install nox
-        run: python -m pip install nox
+      - name: Install mypy
+        run: python -m pip --disable-pip-version-check install mypy==0.981
 
-      - name: Run check for type
-        run: nox -s mypy
+      - name: Run mypy
+        run: mypy -p mesonpy

.github/workflows/ci-sage.yml

@@ -63,7 +63,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out ${{ env.SPKG }}
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           path: build/pkgs/${{ env.SPKG }}/src
       - name: Install prerequisites

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  pytest:
+  test:
     runs-on: ${{ matrix.os }}-latest
     env:
       FORCE_COLOR: true
@@ -35,10 +35,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up target Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
 
@@ -73,7 +73,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Setup Cygwin
         uses: cygwin/cygwin-install-action@v2
@@ -156,7 +156,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Install pyston
         run: |
@@ -198,7 +198,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Install Homebrew Python
         run: |