Update to ytdl-commit-07af47

[YouTube] Improve fix for ae8ba2c
https://github.com/ytdl-org/youtube-dl/commit/07af47960f3bb262ead02490ce65c8c45c01741e

yt_dlp/casefold.py

@@ -0,0 +1,5 @@
+import warnings
+
+warnings.warn(DeprecationWarning(f'{__name__} is deprecated'))
+
+casefold = str.casefold

yt_dlp/jsinterp.py

@@ -812,9 +812,9 @@ class JSInterpreter:
                 \((?P<args>[^)]*)\)\s*
                 (?P<code>{.+})''' % {'name': re.escape(funcname)},
             self.code)
-        code, _ = self._separate_at_paren(func_m.group('code'))
         if func_m is None:
             raise self.Exception(f'Could not find JS function "{funcname}"')
+        code, _ = self._separate_at_paren(func_m.group('code'))
         return [x.strip() for x in func_m.group('args').split(',')], code
 
     def extract_function(self, funcname):