Fixed test action installation

.gitea/workflows/test_before_merge.yaml

@@ -35,7 +35,6 @@ jobs:
           token: ${{ secrets.CI_ACCESS_TOKEN }}
 
       - name: Setting up Python 3.12
-        shell: bash
         run: |
           python3.12 -m venv venv
           source venv/bin/activate
@@ -43,7 +42,6 @@ jobs:
           bash ./install.sh -dev
 
       - name: Testing with pytest
-        shell: bash
         run: |
           source venv/bin/activate
           python3.12 -m pytest