chore: test build layer hardware to 8 core

Author: heitorlessa

.github/workflows/publish_v2_layer.yml

@@ -32,7 +32,7 @@ jobs:
   build-layer:
     permissions:
       contents: read
-    runs-on: aws-lambda-powertools_ubuntu-latest_4-core
+    runs-on: aws-lambda-powertools_ubuntu-latest_8-core
     defaults:
       run:
         working-directory: ./layer