[cleanup] Misc (#17031)

Closes #17104
Authored by: seproDev, bashonly

Co-authored-by: bashonly <88596187+bashonly@users.noreply.github.com>

yt_dlp/__init__.py

@@ -296,7 +296,7 @@ def validate_options(opts):
             default_step = start if op or limit else 0
             return lambda n: min(float(start) + float(step or default_step) * n, float(limit or 'inf'))
 
-    for key, expr in opts.retry_sleep.items():
+    for key, expr in list(opts.retry_sleep.items()):
         if not expr:
             del opts.retry_sleep[key]
             continue