fix(contracts): OZ-M01 L2USDCGateway Is Missing Rate Limiter Functionality

[zimpha]

Purpose or design rationale of this PR

This PR fixed the issue reported by Openzepplin (M-01 L2USDCGateway Is Missing Rate Limiter Functionality) during Scroll USDC Gateway audit. The following are the details:

The L1USDCGateway contract inherits from L1ERC20Gateway . When a user initiates a deposit, the _transferERC20In function is called, which in turn invokes the rate limiter function _addUsedAmount . However, the L2USDCGateway contract inherits from L2ERC20Gateway which does not call the rate limiter _addUsedAmount function. This means that USDC withdrawals will not be subject to rate limiting.

Consider ensuring that _addUsedAmount is called when users make a withdrawal in USDC.

PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• fix: A bug fix

Deployment tag versioning

Has tag in common/version.go been updated or have you added bump-version label to this PR?

• No, this PR doesn't involve a new deployment, git tag, docker image tag
• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

[github-actions]

LCOV of commit e7fe44f during Contracts #29

Summary coverage rate:
  lines......: 51.6% (1013 of 1963 lines)
  functions..: 65.6% (227 of 346 functions)
  branches...: no data found

Files changed coverage rate: n/a