CI: Change the system version of the builder

Author: P3TERX

.github/workflows/aria2-builer.yml

@@ -27,10 +27,10 @@ jobs:
         PLATFORMS: [amd64, arm64, armhf, i386]
         include:
         - PLATFORMS: amd64
-          BUILDER_IMAGE: ubuntu:20.04
+          BUILDER_IMAGE: debian:11
           BUILD_SCRIPT: aria2-gnu-linux-build-amd64.sh
         - PLATFORMS: arm64
-          BUILDER_IMAGE: ubuntu:20.04
+          BUILDER_IMAGE: debian:11
           BUILD_SCRIPT: aria2-gnu-linux-cross-build-arm64.sh
         - PLATFORMS: armhf
           BUILDER_IMAGE: ubuntu:16.04