Update build.yml

Author: uNetworkingAB

.github/workflows/build.yml

@@ -66,7 +66,7 @@ jobs:
       matrix:
         include:
           - arch: aarch64
-            os: ubuntu20.04
+            os: ubuntu22.04
     steps:
       - name: Clone
         run: git clone --recursive https://github.com/uNetworking/uWebSockets.js.git