Test GPT-fixed action definer

.github/workflows/check_code.yml

@@ -1,15 +1,23 @@
 name: Flake8 check
 on: [pull_request]
 jobs:
-    flake8 unused imports:
+    flake8_unused_imports:
         runs-on: ubuntu-latest
         steps:
+            - name: Check out repository
+              uses: actions/checkout@v3
+            - name: Set up Python
+              uses: actions/setup-python@v4
+              with:
+                  python-version: 3.11
             - name: Install flake8
               run: pip install flake8
             - name: Checking executables for unused imports
-              run: flake8 --select=F401 `find bin -type f -name pycbc_*`
+              run: flake8 --select=F401 $(find bin -type f -name pycbc_*)
             - name: Checking modules for unused imports
-              run: flake8 --select=F401 `find pycbc | grep '\.py$' | grep -v -e __init__ -e "version.py"`
+              run: |
+                flake8 --select=F401 $(find pycbc | grep '\.py$' | grep -v -e __init__ -e 'version.py')
             - name: Checking tests for unused imports
-              run: flake8 --select=F401 `find test | grep '\.py$' | grep -v test_schemes`
+              run: |
+                flake8 --select=F401 $(find test | grep '\.py$' | grep -v test_schemes)