tests/azure: update dependencies

- github.com/Azure/azure-event-hubs-go/v3 to v3.3.17
- github.com/fluxcd/helm-controller/api to v0.18.0
- github.com/fluxcd/image-automation-controller/api to v0.21.0
- github.com/fluxcd/image-reflector-controller/api to v0.17.0
- github.com/fluxcd/kustomize-controller/api to v0.22.0
- github.com/fluxcd/notification-controller/api to v0.23.0
- github.com/fluxcd/pkg/runtime to v0.13.2
- github.com/hashicorp/terraform-exec to v0.15.0
- github.com/libgit2/git2go/v31 to v31.7.9
- github.com/stretchr/testify to v1.7.1
- go.uber.org/multierr to v1.8.0
- k8s.io/api to v0.23.4
- k8s.io/client-go to v0.23.4

For `github.com/hashicorp/terraform-exec`, a newer version (v0.16.0)
is availabe. This version however contains a breaking change (as it
removes the `tfinstall` module), which I did not want to deal with at
the moment.

Signed-off-by: Hidde Beydals <hello@hidde.co>