Update Go version

Author: duncanharris

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: '~1.16.6'
+          go-version: '~1.17.9'
         id: go
 
       - name: Install utilities