The testsuite build currently fails with:

    $ ginkgo -r --randomize-all --randomize-suites --fail-on-pending --cover --trace --race --progress -v
    Failed to compile mediator:
    # github.com/onsi/gomega/internal
    /go/pkg/mod/github.com/onsi/gomega@v1.33.1/internal/async_assertion.go:556:19: undefined: context.Cause
    note: module requires Go 1.20
    # github.com/onsi/ginkgo/v2/internal
    /go/pkg/mod/github.com/onsi/ginkgo/v2@v2.19.0/internal/spec_context.go:20:17: undefined: context.CancelCauseFunc
    /go/pkg/mod/github.com/onsi/ginkgo/v2@v2.19.0/internal/spec_context.go:33:25: undefined: context.WithCancelCause
    note: module requires Go 1.20

Update to the latest `golang` images to fix the issue.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>