github-actions: Install pytest dependencies

Signed-off-by: Robert Baldyga <robert.baldyga@open-cas.com>

Author: robertbaldyga

.github/workflows/tests-master.yml

@@ -14,7 +14,11 @@ jobs:
     - uses: actions/checkout@v5
     - name: 'Set up Python'
       uses: actions/setup-python@v5
+    - name: Install dependencies
+      run: |
+          python -m pip install --upgrade pip
+          pip install pytest
     - name: 'Build OCF library'
       run: cd tests/functional; make -j
     - name: 'Execute tests'
-      run: cd tests/functional; pytest
+      run: cd tests/functional; python3 -m pytest