Update Marketing POC

What does this MR do and why?

Describe in detail what your merge request does and why.

This update only modifies an MR Template used for Release Post Deprecations.

The existing deprecation template mentioned an individual who is no longer with the company. This MR updates the default marketing POC to @cfoster3.

If this is incorrect, please let me know!

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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.