Update Go versions of pipeline.

Author: v0ctor

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: ["1.20", "1.19"]
+        go: ["1.21", "1.20"]
     steps:
       - name: Checkout
         uses: actions/checkout@v3.3.0