chore: add recognition to the original tests author

Author: xmatthias

.github/workflows/ci.yml

@@ -60,7 +60,6 @@ jobs:
         uv pip install -e ft_client/
         uv pip install -e .
 
-
     - name: Check for version alignment
       run: |
         python build_helpers/freqtrade_client_version_align.py

tests/test_pip_audit.py

@@ -1,3 +1,9 @@
+"""
+Run pip audit to check for known security vulnerabilities in installed packages.
+Original Idea and base for this implementation by Michael Kennedy's blog:
+https://mkennedy.codes/posts/python-supply-chain-security-made-easy/
+"""
+
 import subprocess
 import sys
 from pathlib import Path