Fixed backwards pip install command

.github/workflows/pr-checks.yml

@@ -52,7 +52,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip wheel install flake8
+        pip install wheel flake8
         if [ -f requirements-dev.txt ]; then pip install -r requirements-dev.txt; elif [ -f requirements.txt ]; then pip install -r requirements.txt ; fi
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