update to Go 1.18.

.github/workflows/release.yml

@@ -17,6 +17,8 @@ jobs:
       -
         name: Set up Go
         uses: actions/setup-go@v3
+        with:
+          go-version: 1.18
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v3

go.mod

@@ -1,5 +1,5 @@
 module github.com/alfg/ffmpegd
 
-go 1.16
+go 1.18
 
 require github.com/gorilla/websocket v1.4.2