ci: install from requirements.txt in cirrus

.github/workflows/ci.yml

@@ -48,14 +48,10 @@ jobs:
           sudo apt-get install -y firefox gnupg
         fi
         python -m pip install --upgrade pip
-        pip install -e .[dev]
         pip install -r requirements.txt --require-hashes
+        pip install .[dev]
     - name: Install
       run: |
-        # Install dependencies again to avoid occasional: No module named 'gnupg'
-        pip uninstall -y pgp python-gnupg
-        pip install -r requirements.txt --require-hashes
-        pip install .
         # Print the core versions to a file for caching
         basicswap-prepare --version --withcoins=bitcoin | tail -n +2 > core_versions.txt
         cat core_versions.txt