ci: use codebuild for dist-x86_64-linux-alt

Author: marcoieni

src/ci/github-actions/jobs.yml

@@ -234,7 +234,7 @@ auto:
     env:
       IMAGE: dist-x86_64-linux
       CODEGEN_BACKENDS: llvm,cranelift
-    <<: *job-linux-16c
+    <<: *job-linux-36c-codebuild
 
   - name: dist-x86_64-musl
     env: