Update actions/checkout action to v2.7.0

This MR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	minor	v2.3.4 -> 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 https://github.com/actions/checkout/pull/1238

Full Changelog: https://github.com/actions/checkout/compare/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 https://github.com/actions/checkout/pull/1040
  • Includes backports from the following changes: https://github.com/actions/checkout/pull/964, https://github.com/actions/checkout/pull/1002, https://github.com/actions/checkout/pull/1029
  • Upgraded the licensed version to match what is used in v3.

Full Changelog: https://github.com/actions/checkout/compare/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 https://github.com/actions/checkout/pull/962

Full Changelog: https://github.com/actions/checkout/compare/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 https://github.com/actions/checkout/pull/776
• Prepare changelog for v2.4.2. by @​TingluoHuang in https://github.com/actions/checkout/pull/778

Full Changelog: https://github.com/actions/checkout/compare/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

v2.4.0

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• Convert SSH URLs like org-<ORG_ID>@&#8203;github.com: to https://github.com/ - pr

v2.3.5

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Update dependencies

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