Always use the latest base image for build dockers (#5401)

Author: Yi Huang

.docker/ubuntu-24.04/Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1: Base image
-FROM ubuntu:24.04@sha256:c4570d2f4665d5d118ae29fb494dee4f8db8fcfaee0e37a2e19b827f399070d3 AS base
+FROM ubuntu:24.04@sha256:7c06e91f61fa88c08cc74f7e1b7c69ae24910d745357e0dfe1d2c0322aaf20f9 AS base
 
 LABEL org.opencontainers.image.source https://github.com/microsoft/msquic
 

.github/dependabot.yml

@@ -35,8 +35,7 @@ updates:
 
   - package-ecosystem: "docker"
     directories:
-      - "/.docker/ubuntu-20.04"
-      - "/.docker/ubuntu-22.04"
+      - "/.docker/*"
     schedule:
       interval: "weekly"
       day: "saturday"