fix(deps): update dependency form-data to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
form-data	^3.0.0 -> ^4.0.0

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Release Notes

form-data/form-data

v4.0.0

Compare Source

• Merge pull request #​382 from wxt2005/custom-stream 8968e01
• Fix typo e705c0a
• Merge branch &#​39;master&#​39; of github.com:form-data/form-data into custom-stream b7b7dee
• Update README for custom stream behavior 6dd8624
• Handle custom stream a3e191d

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[erezrokah]

Not sure why this is a breaking change. See form-data/form-data#382 (comment)

We use it in our tests and in a function template.