fix tx builder export after ethers upgrade

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[coveralls]

Pull Request Test Coverage Report for Build 11010677381

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 99.719%

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Totals
Change from base Build 11000027385:	0.0%
Covered Lines:	665
Relevant Lines:	666

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