ci: use latest Alpine Azure CLI image

Our Azure CLI versions of the runner image are failing to build currently. It looks like the problem is that Microsoft switched from Alpine to cbl-mariner after v2.63.0. For now I'm pinning to that version since our build process expects Alpine.

docker-bake.hcl

@@ -13,6 +13,5 @@ target "gcp" {
 target "azure" {
     target = "azure"
     platforms = ["linux/amd64", "linux/arm64"]
-    args = {"BASE_IMAGE": "mcr.microsoft.com/azure-cli:latest"}
+    args = {"BASE_IMAGE": "mcr.microsoft.com/azure-cli:2.63.0"}
 }
-