Add security announcements to the release notes

[mickhawkins]

The AI linting spelling error due to a PHP filename is causing linting failures on a bunch of other pull requests, so fixing it here on the commit before my release notes additions.

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[andrewnicols]

This is wrong. There are four backticks together in another part of the file. See #1151

[mickhawkins]

Thanks @andrewnicols, I've removed the linting fix commit.

[HuongNV13]

Thanks, Mick. Looks good to me