Update 15-9-license-compliance-ci-template.yml

What does this MR do and why?

Adjust removal date in deprecation announcement.

The removal of the License Scanning template was pushed to %16.3 but the announcement was not updated.

See gitlab-com/Product#5739 (comment 1401899098)

Screenshots or screen recordings

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Before	After

How to set up and validate locally

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MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.