chore(deps): bump ubuntu from jammy-20240227 to jammy-20240416 in /iron

Bumps ubuntu from jammy-20240227 to jammy-20240416.

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

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

iron/Dockerfile

@@ -16,7 +16,7 @@
 # This Dockerfile is based on https://github.com/AtsushiSaito/docker-ubuntu-sweb
 # which is released under the Apache-2.0 license.
 
-FROM ubuntu:jammy-20240227
+FROM ubuntu:jammy-20240416
 
 ARG TARGETPLATFORM
 LABEL maintainer="Tiryoh<tiryoh@gmail.com>"