Support Safari 15.5

[HLFH]

Hello @jancborchardt
Hi @ChristophWurst

In Global, Safari 15.6 is 0.30%.
Safari 15.5 is 0.04 %.

Some designers don't update quickly MacOS because they fear the design softwares (Adobe CC for example) they are using might break or bug too heavily for a good reason: it has happened for them in the past. Therefore, they could even fear minor updates of anything: Safari for example. I don't think the "0.25%" threshold should be reduced as it could make the whole thing bloated, but we could be more considerate for designers that fear updates and work disruption.
And we could do that by including the Safari version that is just before the Safari version above the 0.25% threshold, which is at this time: Safari 15.5.

[skjnldsv]

@HLFH thanks for your intereset!

Safari 15.x is last supported on catalina, which is 5 MacOS versions old.
And it's last version available is 15.6, which is supported by Nextcloud.

I don't think it's fair to add old unsupported versions when there is a minor update available for all MacOS versions shipping 15

Nonetheless, I'm curious, what issues are you experiencing on 15.5 that made you create this PR? :)

[skjnldsv]

Additionally, I see no differences in the shipped features (aside maybe webp and webm, bu they require a recent MacOS version anyway)

https://caniuse.com/?compare=safari+15.5,safari+15.6,safari+16.0&compareCats=all

For me that is not necessary :)

[susnux]

Our official docs say we support iOS 15.0+

I think the problem is that this browserslist is very generic and is not updated with our documentation / official supported versions. So we should somehow sync this with the documentation.

[ChristophWurst]

I agree that the browserslist config should be synced with the official docs as closely as possible.