Update cimg/python Docker tag to v3.12.7 (#173)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| cimg/python | docker | patch | `3.12.6` -> `3.12.7` |

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.circleci/config.yml

@@ -7,7 +7,7 @@ orbs:
 executors:
   python:
     docker:
-      - image: cimg/python:3.12.6
+      - image: cimg/python:3.12.7
   python-machine:
     machine:
       docker_layer_caching: true