workflow: *properly* specify python3

.forgejo/workflows/pylint.yml

@@ -23,8 +23,8 @@ jobs:
     - uses: actions/checkout@v3
     - name: Install Python Deps
       run: |
-        python3 install --upgrade pip
-        pip install -r requirements.txt
+        python3 -m pip install --upgrade pip
+        python3 -m pip install -r requirements.txt
     - name: Analysing the code with pylint
       run: |
         pylint $(git ls-files '*.py')