chore: update postgis versions

Author: CloudNativePG Automated Updates

postgis/metadata.json

@@ -5,7 +5,17 @@
     "shared_preload_libraries": [],
     "extension_control_path": [],
     "dynamic_library_path": [],
-    "ld_library_path": ["/system"],
-    "major_version": "3"
+    "ld_library_path": [
+      "/system"
+    ],
+    "major_version": "3",
+    "versions": {
+      "bookworm": {
+        "18": "3.6.0+dfsg-3.pgdg12+1"
+      },
+      "trixie": {
+        "18": "3.6.0+dfsg-3.pgdg13+1"
+      }
+    }
   }
 }