[13.x] Fix Str::camel() not lowercasing multibyte first characters - #61545
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Str::camel()lowercases the first character with PHP's nativelcfirst(), which only handles ASCII letters, so strings that start with an accented or non-Latin letter keep their capital:Str::studly()already capitalises each word with the multibyte-safeStr::ucfirst(), so this PR switchescamel()to the matchingStr::lcfirst(). ASCII strings are unaffected.