[Ruby 3.4] warn/error passing a block to a method which never use a block

[andrykonchin]

Changes:

Passing a block to a method which doesn't use the passed block will show
a warning on verbose mode (-w).
In connection with this, a new strict_unused_block warning category was introduced.
Turn them on with -W:strict_unused_block or Warning[:strict_unused_block] = true.
[Feature #15554]