Update dependency execa to ^3.4.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
execa	devDependencies	minor	^3.4.0	source

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Release Notes

sindresorhus/execa

v3.4.0

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Features

• Add serialization option. That option was added to child_process methods in Node.js 13.2.0. (#​392)

v3.3.0

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Features

• Allow setting the windowsHide option (#​388). The option still defaults to true. However previously it could not be set to false.

Documentation

• Add tip on how to retry Execa on failure (#​386).
• Improve examples (#​385)

Thanks @​justsml for helping improving the documentation!

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