Update deprecated actions

Author: sovrasov

.github/workflows/main.yaml

@@ -15,15 +15,15 @@ jobs:
 
     steps:
     - name: Checkout repository and submodules
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         submodules: recursive
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
     - name: Cache pip
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         # This path is specific to Ubuntu
         path: ~/.cache/pip