Update actions/checkout action to v2.7.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	minor	v2.4.0 → v2.7.0

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Release Notes

actions/checkout (actions/checkout)

v2.7.0

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What's Changed

• Add new public key for known_hosts (#​1237) by @​TingluoHuang in #​1238

Full Changelog: actions/checkout@v2.6.0...v2.7.0

v2.6.0

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What's Changed

• Add backports to v2 branch by @​cory-miller in #​1040
  • Includes backports from the following changes: #​964, #​1002, #​1029
  • Upgraded the licensed version to match what is used in v3.

Full Changelog: actions/checkout@v2.5.0...v2.6.0

v2.5.0

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What's Changed

• Update @​actions/core to 1.10.0 by @​rentziass in #​962

Full Changelog: actions/checkout@v2...v2.5.0

v2.4.2

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What's Changed

• Add set-safe-directory input to allow customers to take control. (#​770) by @​TingluoHuang in #​776
• Prepare changelog for v2.4.2. by @​TingluoHuang in #​778

Full Changelog: actions/checkout@v2...v2.4.2

v2.4.1

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• Fixed an issue where checkout failed to run in container jobs due to the new git setting safe.directory

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