[Snyk] Security upgrade ubuntu from lunar-20230615 to 23.04 (#12232)

* fix: utils/docker/Dockerfile-cpu to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-UBUNTU2304-GLIBC-5901400
- https://snyk.io/vuln/SNYK-UBUNTU2304-GLIBC-5901400
- https://snyk.io/vuln/SNYK-UBUNTU2304-GLIBC-5927364
- https://snyk.io/vuln/SNYK-UBUNTU2304-GLIBC-5927364
- https://snyk.io/vuln/SNYK-UBUNTU2304-XZUTILS-5854648

* Update Dockerfile-cpu

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: snyk-bot <snyk-bot@snyk.io>

utils/docker/Dockerfile-cpu

@@ -3,7 +3,7 @@
 # Image is CPU-optimized for ONNX, OpenVINO and PyTorch YOLOv5 deployments
 
 # Start FROM Ubuntu image https://hub.docker.com/_/ubuntu
-FROM ubuntu:lunar-20230615
+FROM ubuntu:23.04
 
 # Downloads to user config dir
 ADD https://ultralytics.com/assets/Arial.ttf https://ultralytics.com/assets/Arial.Unicode.ttf /root/.config/Ultralytics/