style: Fix PLW0120 linting issue by removing unnecessary else clause

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

Author: devin-ai-integration[bot]

airbyte/_executors/python.py

@@ -196,8 +196,7 @@ def get_installed_version(
             for line in output.splitlines():
                 if line.startswith("Version:"):
                     return line.split(":", 1)[1].strip()
-            else:
-                return None
+            return None
         except Exception:
             if raise_on_error:
                 raise