build: bump golang: 1.19 -> 1.19.1 (#5099)

Golang Announcement: https://groups.google.com/g/golang-announce/c/x49AQzIVX-s

Notably:
* CVE-2022-27664 and Go issue https://go.dev/issue/54658

Also adding 'opa version' output to the binary smoke tests for easier
verification here.

Signed-off-by: Stephan Renatus <stephan.renatus@gmail.com>