Update Go to 1.20.6,1.19.11

go1.20.6 (released 2023-07-11) includes a security fix to the net/http
package, as well as bug fixes to the compiler, cgo, the cover tool, the
go command, the runtime, and the crypto/ecdsa, go/build, go/printer,
net/mail, and text/template packages. See the Go 1.20.6 milestone on
our issue tracker for details.

https://github.com/golang/go/issues?q=milestone%3AGo1.20.6+label%3ACherryPickApproved

Full diff: https://github.com/golang/go/compare/go1.20.5...go1.20.6

These minor releases include 1 security fixes following the security policy:

- net/http: insufficient sanitization of Host header

The HTTP/1 client did not fully validate the contents of the Host header.
A maliciously crafted Host header could inject additional headers or
entire requests. The HTTP/1 client now refuses to send requests containing
an invalid Request.Host or Request.URL.Host value.

Thanks to Bartek Nowotarski for reporting this issue.

Includes security fixes for CVE-2023-29406 and Go issue https://go.dev/issue/60374

Signed-off-by: Danny Canter <danny@dcantah.dev>

contrib/Dockerfile.test

@@ -29,7 +29,7 @@
 #   docker run --privileged containerd-test
 # ------------------------------------------------------------------------------
 
-ARG GOLANG_VERSION=1.20.5
+ARG GOLANG_VERSION=1.20.6
 ARG GOLANG_IMAGE=golang
 
 FROM ${GOLANG_IMAGE}:${GOLANG_VERSION} AS golang