chore(packages): update percy/exec-action action to v0.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
percy/exec-action	action	patch	v0.3.0 -> v0.3.1

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Release Notes

percy/exec-action

### [`v0.3.1`](https://togithub.com/percy/exec-action/releases/tag/v0.3.1) [Compare Source](https://togithub.com/percy/exec-action/compare/v0.3.0...v0.3.1) ##### What changed? - bump [@​actions/core](https://togithub.com/actions/core) from 1.2.0 to 1.2.6 ([#​18](https://togithub.com/percy/exec-action/issues/18)) (Fixes [#​20](https://togithub.com/percy/exec-action/issues/20))

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