style: Fix TRY300 linting issue by moving return statement to else block

Co-Authored-By: Aaron <AJ> Steers <aj@airbyte.io>

Author: devin-ai-integration[bot]

airbyte/_executors/python.py

@@ -198,7 +198,9 @@ def get_installed_version(
                 if line.startswith("Version:"):
                     version = line.split(":", 1)[1].strip()
                     break
-            return version
+            if version is not None:
+                return version
+            return None
         except Exception:
             if raise_on_error:
                 raise