Update ERC-4337: bunder to bundler

[knorjador]

typo bunder to bundler

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[eip-review-bot]

File ERCS/erc-4337.md

Requires 1 more reviewers from @drortirosh, @forshtat, @kristofgazso, @shahafn, @tjade273, @vbuterin, @yoavw

[SamWilsn]

Closing because of conflicts. Once those are resolved, feel free to open a new PR.