Use Go 1.16 for binaries

Author: weeco

.github/workflows/release-on-tag.yaml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15
+          go-version: 1.16
 
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v2