Update DNS.yml

.github/workflows/DNS.yml

@@ -94,7 +94,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Install tools
-      run:  brew update && brew install socat;
+      run:  brew install socat
     - name: Clone acmetest
       run: cd .. && git clone https://github.com/acmesh-official/acmetest.git  && cp -r acme.sh acmetest/
     - name: Run acmetest