Update Go to 1.17.6
go1.17.6 (released 2022-01-06) includes fixes to the compiler, linker, runtime,
and the crypto/x509, net/http, and reflect packages. See the Go 1.17.6 milestone
on our issue tracker for details:
https://github.com/golang/go/issues?q=milestone%3AGo1.17.6+label%3ACherryPickApproved
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>