Pin upload-pages-artifact to v5.0.0

[pratyush618]

Summary

The Pages deploy workflow was failing at Set up job with:

Error: Unable to resolve action `actions/upload-pages-artifact@v5`, unable to find version `v5`

Root cause

actions/upload-pages-artifact does not currently maintain a v5 major-version ref. Only the full semver tag v5.0.0 exists — no v5 git tag, no v5 branch. GitHub Actions resolution fails because @v5 has no target.

Audited all other actions via git ls-remote --tags + --heads: every other pin is fine.

Action	Pin	Resolves via
actions/checkout@v6	✓	refs/tags/v6
pnpm/action-setup@v5	✓	refs/tags/v5
actions/setup-node@v6	✓	refs/tags/v6
github/codeql-action/{init,analyze}@v4	✓	refs/tags/v4
actions/dependency-review-action@v4	✓	refs/heads/v4 (branch)
actions/deploy-pages@v5	✓	refs/tags/v5
actions/upload-pages-artifact@v5	✗	no such ref

Fix

Pin to the exact semver that exists:

- - uses: actions/upload-pages-artifact@v5
+ - uses: actions/upload-pages-artifact@v5.0.0

Kept deploy-pages@v5 as-is. Dependabot (github-actions ecosystem, already configured) will propose bumps to v5.0.1/v5.1.0 as they ship, and to @v5 once the maintainers publish the major alias.

Test plan

• Merge triggers Deploy docs portal to GitHub Pages
• Set up job resolves upload-pages-artifact@v5.0.0 without error
• build job completes → deploy job publishes → docs.byteveda.org serves the new portal