Don't require 'trigger_template' since it conflicts with 'github' in beta.

[nat-henderson]

Fixes hashicorp/terraform-provider-google#4928.

Release Note Template for Downstream PRs (will be copied)

`cloudbuild`: Fixed incorrect dependency between `trigger_template` and `github` in `google_cloud_build_trigger`.

[modular-magician]

Hi! I'm the modular magician, I work on Magic Modules.
I see that this PR has already had some downstream PRs generated. Any open downstreams are already updated to your most recent commit, b938bbb.

Pull request statuses

No diff detected in terraform-google-conversion.
No diff detected in Inspec.

New Pull Requests

I built this PR into one or more new PRs on other repositories, and when those are closed, this PR will also be merged and closed.
depends: hashicorp/terraform-provider-google-beta#1410
depends: hashicorp/terraform-provider-google#4946
depends: ansible-collections/google.cloud#91

[danawillow]

Can we also get a docs update mentioning that exactly one of the two must be specified?

[danawillow]

Also watch out for CHANGELOG style: https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md#release-note-style-guide-terraform-specific

[modular-magician]

Hi! I'm the modular magician, I work on Magic Modules.
I see that this PR has already had some downstream PRs generated. Any open downstreams are already updated to your most recent commit, 9511344.

Pull request statuses

terraform-provider-google-beta already has an open PR.
No diff detected in terraform-google-conversion.
terraform-provider-google already has an open PR.
Ansible already has an open PR.
No diff detected in Inspec.

New Pull Requests

I didn't open any new pull requests because of this PR.