Update dependency @actions/exec to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@actions/exec (source)	^1.1.1 → ^3.0.0

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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()

v2.0.0

• Add support for Node 24 #​2110
• Bump @​actions/io dependency from ^1.0.1 to ^2.0.0

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