Bump actions/checkout from v1 to v2.3.1

[dependabot]

Bumps actions/checkout from v1 to v2.3.1.

Release notes

Sourced from actions/checkout's releases.

v2.3.1

Fix default branch resolution for .wiki and when using SSH

Changelog

Sourced from actions/checkout's changelog.

v2.3.1

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

v2.3.0

• Fallback to the default branch

v2.2.0

• Fetch all history for all tags and branches when fetch-depth=0

v2.1.1

• Changes to support GHES (here and here)

v2.1.0

• Group output
• Changes to support GHES alpha release
• Persist core.sshCommand for submodules
• Add support ssh
• Convert submodule SSH URL to HTTPS, when not using SSH
• Add submodule support
• Follow proxy settings
• Fix ref for pr closed event when a pr is merged
• Fix issue checking detached when git less than 2.22

v2.0.0

• Do not pass cred on command line
• Add input persist-credentials
• Fallback to REST API to download repo

v2 (beta)

• Improved fetch performance
  • The default behavior now fetches only the SHA being checked-out
• Script authenticated git commands
  • Persists with.token in the local git config
  • Enables your scripts to run authenticated git commands
  • Post-job cleanup removes the token
  • Coming soon: Opt out by setting with.persist-credentials to false
• Creates a local branch
  • No longer detached HEAD when checking out a branch
  • A local branch is created with the corresponding upstream branch set
• Improved layout
  • with.path is always relative to github.workspace
  • Aligns better with container actions, where github.workspace gets mapped in

Commits

• 28c7f3d changelog
• fb6f360 fix default branch for .wiki and when using ssh (#284)
• b4483ad changelog
• 00a3be8 determine default branch (#278)
• 453ee27 update troubleshooting instructions to include 'npm run format'
• 65865e1 build because all is no more (#264)
• aabbfeb changelog
• e52d022 Fetch all history for all tags and branches when fetch-depth=0 (#258)
• 2ff2fbd telemetry for incorrect merge commit (#253)
• df86c82 fix readme (#251)
• Additional commits viewable in compare view

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