[parser] CI: Use Go 1.16 instead of Go 1.13 (#1241)
[parser] CI: Use Go 1.16 instead of Go 1.13 (#1241)

The Integration Test output currently has this:

```
note: module requires Go 1.16
```
coocood/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,c4pt0r/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,pingcap/tidb,coocood/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,kyle-wang/tidb