Update Python setup in Github Action

Author: cortinico

.github/workflows/pre-merge.yaml

@@ -9,15 +9,15 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout Repo
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
     - name: Setup Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v2
       with:
-        python-version: 3.7.6
+        python-version: 3.7
     - name: Install Python dependencies
       run: python -m pip install virtualenv pre-commit
     - name: Setup Java
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v2
       with:
         java-version: 11
     - name: Run gradle preMerge task