Update actions/checkout action to v2

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
actions/checkout	action	major	v2	source

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Release Notes

actions/checkout

v2

Compare Source

• Fix default branch resolution for .wiki and when using SSH

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Configuration

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Merged by: LawnGnome at 2021-10-13 21:07:34 UTC