go 1.16 features

- use go embed instead of go-binary and remove all about old assets (go 1.16 feature)
- pin gox version (go 1.16 feature)
- update ci to go 1.16

script/check_formatting.sh

@@ -1,8 +1,5 @@
 #!/bin/bash
 
-# Run the fmt on bindata so it does not trigger failure
-go fmt ./pkg/data/bindata.go > /dev/null
-
 # Get list of offending files
 files="$(go fmt ./pkg/...)"