Upgrade latest Alpine to 3.21 for VMR builds (#45415)

Author: mthalman

eng/pipelines/templates/variables/vmr-build.yml

@@ -20,12 +20,12 @@ variables:
 - name: alpineLatestContainerName
   value: alpineLatestContainer
 - name: alpineLatestContainerImage
-  value: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.20-withnode
+  value: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.21-amd64
 
 - name: alpinePreviousContainerName
   value: alpinePreviousContainer
 - name: alpinePreviousContainerImage
-  value: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.19-WithNode
+  value: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.20-withnode
 
 - name: centOSStreamContainerName
   value: centOSStreamContainer
@@ -100,9 +100,9 @@ variables:
 - name: almaLinuxName
   value: AlmaLinux8
 - name: alpineLatestName
-  value: Alpine320
+  value: Alpine321
 - name: alpinePreviousName
-  value: Alpine319
+  value: Alpine320
 - name: centOSStreamName
   value: CentOSStream9
 - name: fedoraName
@@ -119,9 +119,9 @@ variables:
 - name: linuxMuslArm64Rid
   value: linux-musl-arm64
 - name: alpineLatestX64Rid
-  value: alpine.3.20-x64
+  value: alpine.3.21-x64
 - name: alpinePreviousX64Rid
-  value: alpine.3.19-x64
+  value: alpine.3.20-x64
 - name: centOSStreamX64Rid
   value: centos.9-x64
 - name: fedoraX64Rid

src/SourceBuild/content/eng/pipelines/ci.yml

@@ -82,10 +82,10 @@ extends:
         image: mcr.microsoft.com/dotnet-buildtools/prereqs:almalinux-8-source-build
         options: --privileged
       alpineLatestContainer:
-        image: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.20-withnode
+        image: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.21-amd64
         options: --privileged
       alpinePreviousContainer:
-        image: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.19-WithNode
+        image: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.20-withnode
         options: --privileged
       centOSStreamContainer:
         image: mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream9