[ci] ensure artifact names are unique

the last deploy failed with https://github.com/fonttools/fonttools/actions/runs/7799843107

.github/workflows/wheels.yml

@@ -73,7 +73,7 @@ jobs:
         CIBW_ARCHS: ${{ matrix.arch }}
     - uses: actions/upload-artifact@v4
       with:
-        name: wheels
+        name: wheels-${{ matrix.os }}-${{ matrix.arch }}
         path: wheelhouse/*.whl
 
   build_arch_wheels:
@@ -100,7 +100,7 @@ jobs:
         CIBW_ARCHS: ${{ matrix.arch }}
     - uses: actions/upload-artifact@v4
       with:
-        name: aarch64-wheels
+        name: wheels-py${{ matrix.python }}-linux-${{ matrix.arch }}
         path: wheelhouse/*.whl
 
   deploy: