Update the Container Scanning Matrix. Container Scanning is available in the...

Step 1: What is changing in this MR?

Container Scanning was moved to Gitlab free in 15.0 but it is stated as only available in premium/ultimate on the webiste.

Link: https://about.gitlab.com/pricing/feature-comparison/

Proof is the documentation as well as the release notes: https://about.gitlab.com/releases/2022/05/22/gitlab-15-0-released/

Step 2: Ensure that your changes comply with the following, where applicable:

• These changes work on both Safari, Chrome, and Firefox.

Site is displayed as expected now in the preview-app:

Step 4: Tag the appropriate person for review

Depending on which label is used, you may tag the following people as a Reviewer on this MR:

1. Level 1: Any member of the Digital Experience Team