Update actions/checkout requirement to v2.3.3

[dependabot]

Updates the requirements on actions/checkout to permit the latest version.

Release notes

Sourced from actions/checkout's releases.

v2.3.3

• Remove Unneeded commit information from build logs
• Add Licensed to verify third party dependencies

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

• See full diff in compare view

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[codecov]

Codecov Report

Merging #367 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #367   +/-   ##
=========================================
  Coverage     82.54%   82.54%           
  Complexity     1340     1340           
=========================================
  Files            65       65           
  Lines          3249     3249           
  Branches       1043     1043           
=========================================
  Hits           2682     2682           
  Misses          177      177           
  Partials        390      390           

Flag	Coverage Δ	Complexity Δ
#unittests	82.54% <ø> (ø)	1340.00 <ø> (ø)

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[petertrr]

Seems like with checkout@v2 codecov receives hash of temporary merge commit, not the hash of last commit in source branch. This needs some investigation.
Related discussion - actions/checkout#237
Edit: for two commits in this PR everything seems to be fine: action/checkout logs that it merges branches, but codecov receives report for commit from source branch.
Edit 2: in commit 935f788 it seems to once again show incorrect behavior

[orchestr7]

lgtm when they will fix issues

[petertrr]

lgtm when they will fix issues

I'll keep version 1 in build_and_test where we face issues and update in other workflows, where merge commit doesn't matter.