Update go-build.yml

Author: Allan-Nava

.github/workflows/go-build.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [ '1.18.x', '1.19.x', '1.20.x' ]
+        go-version: [ '1.18.x', '1.19.x', '1.20.x', '1.21.x' ]
     steps:
     - uses: actions/checkout@v3
     #
@@ -23,4 +23,4 @@ jobs:
     - name: Build
       run: go build -v ./...
     #
-  #
+  #