[MISC] Update snapped PostgreSQL (#832)

Author: sinclert-canonical

src/constants.py

@@ -35,7 +35,7 @@
 SNAP_PACKAGES = [
     (
         POSTGRESQL_SNAP_NAME,
-        {"revision": {"aarch64": "156", "x86_64": "155"}},
+        {"revision": {"aarch64": "168", "x86_64": "167"}},
     )
 ]