website: Set 13.3 as EoL

[jrm]

Summary

FreeBSD 13.3 went EoL on December 31, 2024.

[cperciva]

I think we decided that removing EoL releases from the website is secteam's job.

[carlavilla]

Ok from docs side

[lwhsu]

As there is no announcement of extension from sectem or releng, I believe it's fine to commit this without explicitly approval from them.

[emaste]

website/static/security/advisory-template.txt

125

this too

website/static/security/errata-template.txt

123–124

this too

[jrm]

Address @emaste's comments by removing more references to 13.3 in advisory-template.txt and errata-template.txt

[cperciva]

In D48351#1102610, @lwhsu wrote:

As there is no announcement of extension from sectem or releng, I believe it's fine to commit this without explicitly approval from them.

Right, I just wanted to pull secteam into the conversation since I think they have a list of places which need to be updated.