internal/ci: use go1.20.3 for releases
go1.20.3 (released 2023-04-04) includes security fixes to the go/parser,
html/template, mime/multipart, net/http, and net/textproto packages, as
well as bug fixes to the compiler, the linker, the runtime, and the time
package.
Pick up this latest version ahead of our release of v0.6.0-alpha.1
Signed-off-by: Paul Jolly <paul@myitcv.io>
Change-Id: I867c9b7793aea7350088dd24fa09cc5987483fb8
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/552503
Unity-Result: CUEcueckoo <cueckoo@cuelang.org>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>