Update test matrix to go1.22, go1.21, and go1.20

Author: daniel-nichter

.github/workflows/go.yml

@@ -16,8 +16,9 @@ jobs:
       fail-fast: false
       matrix:
         go:
+          - '1.22'
+          - '1.21'
           - '1.20'
-          - '1.19'
     steps:
     - uses: actions/checkout@v3