Update mcr.microsoft.com/devcontainers/python Docker tag to v3.12 (#10)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| mcr.microsoft.com/devcontainers/python | image | minor |
`3.11-bullseye` -> `3.12-bullseye` |

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.devcontainer.json

@@ -1,6 +1,6 @@
 {
     "name": "ludeeus/integration_blueprint",
-    "image": "mcr.microsoft.com/devcontainers/python:3.11-bullseye",
+    "image": "mcr.microsoft.com/devcontainers/python:3.12-bullseye",
     "postCreateCommand": "scripts/setup",
     "forwardPorts": [
         8123