Tiny improvement security

[Felixoid]

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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

A tiny improvement to SECURITY.md

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[alexey-milovidov]

This makes it ambiguous.

[Felixoid]

so, when 23.8 will remain the last supported version in 23, it's better to have all the rest of the year? That's the current logic, and we can leave it as it is.

[alexey-milovidov]

Yes. No ambiguity.

[Felixoid]

Ok, I'll then only improve readability

[alexey-milovidov]

@Felixoid If you say "23.3 is supported" and "23.* is unsupported" it is controversial, it can be put out of context, and generally not good. Being as precise as possible is better.

[Felixoid]

Sure, I've brought them back. I meant the script readability.

As well, I'll backport it to release branches to have .dockerignore removed there. It's necessary for #31473

[Felixoid]

It's checked by style check, and I've tested all docker images from this branches for tags from 22.3.20.29 to 23.10.4.25