style: Fix TRY300 linting issue by moving return None to else block

Co-Authored-By: Aaron <AJ> Steers <[email protected]>

Author: devin-ai-integration[bot]

airbyte/_executors/python.py

@@ -196,8 +196,8 @@ def get_installed_version(
             for line in output.splitlines():
                 if line.startswith("Version:"):
                     return line.split(":", 1)[1].strip()
-                continue
-            return None
+            else:
+                return None
         except Exception:
             if raise_on_error:
                 raise