Revert the last instance of str_starts_with() in update-core.php

[azaozz]

Follow-up to: https://core.trac.wordpress.org/ticket/58206#comment:64 by @frankit.

I might be wrong but I just commented on the github commit that it looks to me that str_starts_with() on line 1429 has been left over.

I'm getting Fatal error: Uncaught Error: Call to undefined function str_starts_with() [...] from that line while trying to update from a wp < 5.7 to latest 6.3

[azaozz]

Patch is at: ​https://github.com/WordPress/wordpress-develop/pull/5034.

[azaozz]

In 56417:

Revert the last use of str_starts_with() in update-core.php.

Fixes updating WordPress from 5.7 and earlier versions. When doing the update this file runs first in the old version where the polifills may not be available.

Porps: frankit.
Fixes: #59145.

[azaozz]

Reopen for 6.3.1 consideration.

[audrasjb]

Looks good to me.
Marking as dev-reviewed and backporting right now.

[audrasjb]

In 56425:

General: Revert the last use of str_starts_with() in update-core.php.

Fixes updating WordPress from 5.7 and earlier versions. When doing the update this file runs first in the old version where the polifills may not be available.

Props frankit, azaozz.
Reviewed by audrasjb.
Merges [56417] to the 6.3 branch.
Fixes #59145.