Use Go 1.16 in release job

To make goreleaser recognize arm64, use go 1.16 here as well.

.github/workflows/go.yml

@@ -30,6 +30,10 @@ jobs:
     if: ${{ startsWith(github.ref, 'refs/tags/') && contains(fromJSON('["mxschmitt", "JonasProgrammer"]'), github.actor) }}
     steps:
       - uses: actions/checkout@v2
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v2
         with: