ci: bump actions/checkout from 2.4.0 to 3

[dependabot]

Bumps actions/checkout from 2.4.0 to 3.

Release notes

Sourced from actions/checkout's releases.

v3.0.0

• Update default runtime to node16

Changelog

Sourced from actions/checkout's changelog.

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

... (truncated)

Commits

• a12a394 update readme for v3 (#708)
• 8f9e05e Update to node 16 (#689)
• 230611d Change secret name for PAT to not start with GITHUB_ (#623)
• See full diff in compare view

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[codecov]

Codecov Report

Merging #715 (be569ef) into main (c188bee) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #715   +/-   ##
=======================================
  Coverage   61.73%   61.73%           
=======================================
  Files           4        4           
  Lines         277      277           
  Branches       49       49           
=======================================
  Hits          171      171           
  Misses        105      105           
  Partials        1        1           

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