Pin official GH actions to the major digit

.github/workflows/pre-commit-autoupdate.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2.1.3
+    - uses: actions/setup-python@v2
       with:
         python-version: 3.8
 

.github/workflows/update-changelog.yml

@@ -15,9 +15,9 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Set up Python
-      uses: actions/setup-python@v2.1.3
+      uses: actions/setup-python@v2
       with:
-        python-version: "3.8"
+        python-version: 3.8
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip

.github/workflows/update-contributors.yml

@@ -13,9 +13,9 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Set up Python
-      uses: actions/setup-python@v2.1.3
+      uses: actions/setup-python@v2
       with:
-        python-version: "3.8"
+        python-version: 3.8
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip