Use Slightly More Gas For 4337 Test

[nlordell]

Under certain conditions, an E2E test can fail because it uses slightly more gas. This PR adds a larger gas buffer to the E2E test to prevent intermittent failures.

Example failure: https://github.com/safe-global/safe-modules/actions/runs/9990468990/job/27611219692

  1) Singleton Signers [@4337]
       should deploy a new Safe with alternate signing scheme accessing associated storage:
     Error: could not coalesce error (error={ "code": -32500, "message": "verificationGas should have extra 2000 gas. has only 353" }, payload={ ... }, code=UNKNOWN_ERROR, version=6.13.1)

[coveralls]

Pull Request Test Coverage Report for Build 9991309758

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 9990468990:	0.0%
Covered Lines:	51
Relevant Lines:	51

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💛 - Coveralls