chore(deps): bump python

Bumps the production-dependencies group in /docker/metrics-exporter with 1 update: python.


Updates `python` from 3.11-slim to 3.12-slim

---
updated-dependencies:
- dependency-name: python
  dependency-type: direct:production
  dependency-group: production-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

docker/metrics-exporter/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-slim AS build
+FROM python:3.12-slim AS build
 
 WORKDIR /usr/src/app