ci: use go version from go.mod with actions/setup-go

Author: buchdag

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: "1.21"
+          go-version-file: go.mod
 
       - name: Install dependencies
         run: make get-deps