fix(proxy): add zero address check to upgradeTo#354
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If admin accidentally calls upgradeTo(address(0)), the proxy would revert on all non-admin calls. Add a require statement to catch this at the upgradeTo call site instead, preventing accidental DOS. Closes #3835
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🟡 Heimdall Review Status
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If admin accidentally calls upgradeTo(address(0)), the proxy would
revert on all non-admin calls. Add a require statement to catch this
at the upgradeTo call site instead, preventing accidental DOS.