python: bump pet version (#8893)

related to posit-dev/positron-builds#444


### Release Notes

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#### New Features

- N/A

#### Bug Fixes

- Update to use latest Python Environment Tools for Python interpreter
discovery.


### QA Notes

green ci, and normal discovery! i clicked around and everything looks to
be acting as normal.

Author: isabelizimm

extensions/positron-python/package.json

@@ -1909,7 +1909,10 @@
                         }
                     }
                 },
-                "tags": ["positron-assistant", "requires-session:python"]
+                "tags": [
+                    "positron-assistant",
+                    "requires-session:python"
+                ]
             },
             {
                 "name": "getInstalledPythonPackageVersion",
@@ -1925,7 +1928,10 @@
                         }
                     }
                 },
-                "tags": ["positron-assistant", "requires-session:python"]
+                "tags": [
+                    "positron-assistant",
+                    "requires-session:python"
+                ]
             },
             {
                 "name": "get_python_environment_details",
@@ -2239,7 +2245,7 @@
     },
     "positron": {
         "externalDependencies": {
-          "pet": "v2024.16.0"
+            "pet": "2025.12"
         }
-      }
+    }
 }