chore(CI): add go v1.20

Author: appleboy

.github/workflows/go.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go: [1.17, 1.18, 1.19]
+        go: [1.17, 1.18, 1.19, '1.20']
         include:
           - os: ubuntu-latest
             go-build: ~/.cache/go-build