fix: Correct Ubuntu version format in Dockerfile

Author: chefgs

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # DevOps OS dev container (Ubuntu LTS optimized)
-FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
+FROM mcr.microsoft.com/devcontainers/base:ubuntu24.04
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]