ci: remove build for unsupported mingw platform

Author: azeam1

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
         id: fetch
         with:
           supported-ruby-platforms: |
-            exclude: [arm-linux, x64-mingw32, x64-mingw-ucrt]
+            exclude: [arm-linux, x64-mingw32, x64-mingw-ucrt, aarch64-mingw-ucrt]
           stable-ruby-versions: |
             exclude: [head]