Bump test Dockerfile to ubuntu:24.04

Upgrade base image from ubuntu:22.04 to ubuntu:24.04. Package versions
are already unpinned and the Docker repo uses VERSION_CODENAME for
auto-detection. Safe now that #38 removes .pyc host version coupling.

Closes #39

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: szachovy

CHANGELOG.md

@@ -18,6 +18,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+* Bump test Dockerfile base image from ubuntu:22.04 to ubuntu:24.04. (#39)
+
+### Changed
+
 * Completed [ARCHITECTURE.md](./docs/ARCHITECTURE.md) (#93)
 * Migrated CI from self-hosted to GitHub-hosted runners with Docker-in-Docker test infrastructure. (#94)
 * Test workflow always builds service images locally for reproducibility. (#97)

tests/setup/Dockerfile

@@ -1,5 +1,5 @@
 ARG BUILDPLATFORM="amd64"
-FROM --platform=${BUILDPLATFORM} ubuntu:22.04
+FROM --platform=${BUILDPLATFORM} ubuntu:24.04
 
 LABEL version="1.0"