v2.6.2

This maintainence release contains backports from v2.7.0

Bug Fixes

• Fix creation of threads in text channels without Permissions.manage_threads. ( #818 )
• Fix off-by-one error in AutoModKeywordPresets values. ( #820 )
• [ ext.commands ] Fix a case where optional variadic arguments could have infinite loops in parsing depending on the user input. ( #825 )