ci: upgrade the upload-artifact and download-artifact actions (#137)

Bumps the github-actions group with 2 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/upload-artifact` from 4 to 5
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

Updates `actions/download-artifact` from 5 to 6
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/lint-readme.yml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Upload lint results
         if: steps.lint.outcome == 'failure' || steps.lint.outcome == 'success'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: gh-cli-readme-lint-results
           path: gh-cli-readme-lint-results.txt
@@ -50,7 +50,7 @@ jobs:
 
       - name: Upload lint results
         if: steps.lint.outcome == 'failure' || steps.lint.outcome == 'success'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: scripts-readme-lint-results
           path: scripts-readme-lint-results.txt
@@ -67,7 +67,7 @@ jobs:
 
     steps:
       - name: Download lint results
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: ./lint-results/