Update dependency @actions/exec to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@actions/exec (source)	^2.0.0 → ^3.0.0

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Warning

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Release Notes

actions/toolkit (@​actions/exec)

v3.0.0

• Breaking change: Package is now ESM-only
  • CommonJS consumers must use dynamic import() instead of require()

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[renovate]

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