chore(deps): update ubuntu:24.04 docker digest to 728785b (#314)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

validator/Dockerfile

@@ -22,7 +22,7 @@ COPY --from=build /otel_config_validator /otel_config_validator
 
 ENTRYPOINT ["/otel_config_validator"]
 
-FROM ubuntu:24.04@sha256:fdb6c9ceb1293dcb0b7eda5df195b15303b01857d7b10f98489e7691d20aa2a1 AS shelltest
+FROM ubuntu:24.04@sha256:728785b59223d755e3e5c5af178fab1be7031f3522c5ccd7a0b32b80d8248123 AS shelltest
 
 ENV YQ_VERSION="v4.45.1"