Upgrade GitHub Actions to latest versions

[gaurav-nelson]

This pull request updates the GitHub Actions workflow for deploying the site by upgrading several GitHub Actions to their latest major versions. These updates help ensure continued support, security, and access to the latest features.

Workflow dependency upgrades:

• Updated actions/checkout from version 3 to version 5 in .github/workflows/deploy-site.yml.
• Updated actions/configure-pages from version 3 to version 5 in .github/workflows/deploy-site.yml.
• Updated actions/upload-pages-artifact from version 1 to version 4 in .github/workflows/deploy-site.yml.
• Updated actions/deploy-pages from version 2 to version 4 in .github/workflows/deploy-site.yml.

Fixes #246

[mjahoda]

Hi Gaurav. Thank you for the PR. I submitted the fix in #244 some time ago. Unfortunately, the PR hasn't received the required amount of approvals yet. I'll approve yours because with my +1, there's a bigger chance to reach the threshold.

[abhatt-rh]

LGTM

[gaurav-nelson]

Thank you @mjahoda @abhatt-rh

At least 3 approving reviews are required to merge this pull request.

These rules are more stricter than production docs we do.

I'll wait for approvals :)

[abhatt-rh]

You make a good point, @gaurav-nelson !
FWIW, I relaxed it from 4 to 3 approvals yesterday but now I'm wondering if we should just narrow it down to 2 😅

Thank you @mjahoda @abhatt-rh

At least 3 approving reviews are required to merge this pull request.

These rules are more stricter than production docs we do.

I'll wait for approvals :)