Issue #3293637 by wrd-oaitsd, alex.bukach, dydave: TypeError when contrib...

David Suissarequested to merge
issue/block_class-3293637:3293637-typeerror-when-restrictbyip into 4.0.x

https://www.drupal.org/project/block_class/issues/3293637

Fixed TypeError when contrib module restrict_by_ip is also installed.

Replaced class dependency AccountProxy with interface AccountProxyInterface.

Rolled in merge request patch from:
https://www.drupal.org/project/block_class/issues/3293637#comment-15789787

based on the work from @wrd-oaitsd and @AlexBukach.

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