Bump actions/upload-artifact from 6 to 7 (#6906)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.

- vLLM version: v0.16.0
- vLLM main:
15d76f74e2

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

.github/workflows/schedule_release_code_and_wheel.yml

@@ -76,7 +76,7 @@ jobs:
           ls dist
 
       - name: Archive tar.gz
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: vllm-ascend-src
           path: dist/*
@@ -168,7 +168,7 @@ jobs:
           done
 
       - name: Archive wheel
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: vllm-ascend-${{ matrix.os }}-py${{ matrix.python-version }}-wheel
           path: dist/*