Bump debian in /03_maven_tutorial (#556)

Bumps debian from bookworm-20240701 to bookworm-20240812.

---
updated-dependencies:
- dependency-name: debian
  dependency-type: direct:production
...

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

03_maven_tutorial/Dockerfile

@@ -1,5 +1,5 @@
 # Use a base image
-FROM debian:bookworm-20240701 as cloning-stage
+FROM debian:bookworm-20240812 as cloning-stage
 
 # Set ARGs for the GitHub credentials and repository
 ARG GITHUB_USERNAME