Bump actions/upload-artifact from 5 to 6 (#2891)

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

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  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/ci.yml

@@ -40,7 +40,7 @@ jobs:
         if: matrix.java == 17
         run: ./gradlew integ -Plog-tests --stacktrace
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: java-${{ matrix.java }}-${{ matrix.os }}-test-report
@@ -86,7 +86,7 @@ jobs:
     - name: Build docs
       run: cd docs && make html
 
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       with:
         name: built-docs
         path: docs/build/html

.github/workflows/make-docs.yml

@@ -70,7 +70,7 @@ jobs:
         rm $ARTIFACTS_DIR/objects.inv || true
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: smithy-docs
         path: ${{ env.ARTIFACTS_DIR }}