Update GitHub Actions to the latest versions

[jbampton]

https://github.com/actions/setup-node

https://github.com/actions/node-versions

https://github.com/actions/checkout

https://github.com/actions/setup-python

https://github.com/actions/cache

https://github.com/actions/setup-java

https://github.com/actions/upload-artifact

https://github.com/igorshubovych/markdownlint-cli

https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot

[CLAassistant]

All committers have signed the CLA.

[zspitzer]

@jbampton thanks for this, can we stick to the major versions rather than pinning to exact versions to avoid the constant upgrade maintenance dance? (ie just @v4 vs @v4.2.3)

[jbampton]

@zspitzer this is all fixed now.

And I fixed the Markdown linter errors too