ci: bump actions/checkout from 2.3.4 to 2.4.0

[dependabot[bot]]

Bumps actions/checkout from 2.3.4 to 2.4.0.

Release notes

Sourced from actions/checkout's releases.

v2.4.0

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

v2.3.5

Update dependencies

Commits

• ec3a7ce set insteadOf url for org-id (#621)
• fd47087 codeql should analyze lib not dist (#620)
• 3d677ac script to generate license info (#614)
• 826ba42 npm audit fix (#612)
• eb8a193 update dev dependencies and react to new linting rules (#611)
• c49af7c Create codeql-analysis.yml (#602)
• 1e204e9 update licensed check (#606)
• 0299a0d update dist (#605)
• be0f448 Bump ws from 5.2.2 to 5.2.3 (#604)
• 56c00a7 Bump tmpl from 1.0.4 to 1.0.5 (#588)
• Additional commits viewable in compare view

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