Update actions/checkout action to v4.3.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	minor	v4.2.1 → v4.3.1

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Release Notes

actions/checkout (actions/checkout)

v4.3.1

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• Port v6 cleanup to v4 by @​ericsciple in #​2305

v4.3.0

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• docs: update README.md by @​motss in #​1971
• Add internal repos for checking out multiple repositories by @​mouismail in #​1977
• Documentation update - add recommended permissions to Readme by @​benwells in #​2043
• Adjust positioning of user email note and permissions heading by @​joshmgross in #​2044
• Update README.md by @​nebuk89 in #​2194
• Update CODEOWNERS for actions by @​TingluoHuang in #​2224
• Update package dependencies by @​salmanmkc in #​2236

v4.2.2

Compare Source

• url-helper.ts now leverages well-known environment variables by @​jww3 in #​1941
• Expand unit test coverage for isGhes by @​jww3 in #​1946

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