chore(deps): bump actions/upload-artifact from 4 to 5 (codeigniter4#9772)

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

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

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

Author: dependabot[bot]

.github/workflows/deploy-userguide-latest.yml

@@ -57,7 +57,7 @@ jobs:
 
       # Create an artifact of the html output
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: HTML Documentation
           path: user_guide_src/build/html/

.github/workflows/reusable-phpunit-test.yml

@@ -212,7 +212,7 @@ jobs:
 
       - name: Upload coverage results as artifact
         if: ${{ inputs.enable-artifact-upload }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: ${{ env.ARTIFACT_NAME }}
           path: build/cov/coverage-${{ env.ARTIFACT_NAME }}.cov

.github/workflows/reusable-serviceless-phpunit-test.yml

@@ -122,7 +122,7 @@ jobs:
 
       - name: Upload coverage results as artifact
         if: ${{ inputs.enable-artifact-upload }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: ${{ env.ARTIFACT_NAME }}
           path: build/cov/coverage-${{ env.ARTIFACT_NAME }}.cov