Bump python from 3.12.2-slim to 3.12.3-slim in /Docker (#50)

Bumps python from 3.12.2-slim to 3.12.3-slim.

---
updated-dependencies:
- dependency-name: python
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12.2-slim
+FROM python:3.12.3-slim
 
 ARG PORKBUN_DDNS_VERSION=0.0.0