chore(deps): bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build_docs.yml

@@ -29,7 +29,7 @@ jobs:
       run: ./gen.sh
     - name: Archive Schema documentation
       # https://github.com/actions/upload-artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: XML-Schema-documentation
         path: docgen/xml/docs
@@ -53,7 +53,7 @@ jobs:
       run: ./gen.sh
     - name: Archive Schema documentation
       # https://github.com/actions/upload-artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: JSON-Schema-documentation
         path: docgen/json/docs