build(deps): bump python from 3.12.4-slim to 3.12.5-slim in /backend (#2305)

Bumps python from 3.12.4-slim to 3.12.5-slim.

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12.4-slim
+FROM python:3.12.5-slim
 
 ADD tools /src/tools
 ADD backend /src/backend