Rename SECURITY.md to SECURITY.m

[learn-build-service-prod[bot]]

Learn Build status updates of commit dd3cb09:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
SECURITY.m	:white_check_mark:Succeeded
SECURITY.md	:white_check_mark:Succeeded	n/a (file deleted or renamed)

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PRMerger Results

Issue	Description
Unapproved file extension(s)	This PR contains file types that are not supported in the repo. The only supported file types are jpg, gif, png, json, svg and md.
Repository root file	This pull request contains a file submitted to the root of the repository.