add support for golang 1.18 and 1.19

[crossplane-contrib]

add support for golang 1.18 and 1.19

[displague]

I also ran into this problem. crossplane/terrajet#291 seems to correct it.

After that, I ran into another Go 1.18 problem:

ERRO Running error: buildir: failed to load package goarch: could not load export data: cannot import "internal/goarch" (unknown iexport format version 2), export data is newer version - update tool

This is resolved by adding GOLANGCILINT_VERSION ?= 1.48.0 to the Makefile (the version from upbound/build is older)

[raffaelespazzoli]

I'm also getting this error:

/bin/bash: line 1: /home/rspazzol/git/provider-jet-github/.cache/tools/linux_x86_64/goimports: No such file or directory
make[1]: *** [build/makelib/golang.mk:271: go.generate] Error 127
make: *** [build/makelib/common.mk:419: generate] Error 2

the make file should download the needed tools automatically but it doesn't for reasons I can't understand.
running go install golang.org/x/tools/cmd/goimports@latest does not seem to fix the issue.