chore(deps): update actions/upload-artifact action to v6 (#258)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/upload-artifact](https://redirect.github.com/actions/upload-artifact)
| action | major | `v4` → `v6` |

---

### Release Notes

<details>
<summary>actions/upload-artifact (actions/upload-artifact)</summary>

###
[`v6`](https://redirect.github.com/actions/upload-artifact/compare/v5...v6)

[Compare
Source](https://redirect.github.com/actions/upload-artifact/compare/v5...v6)

###
[`v5`](https://redirect.github.com/actions/upload-artifact/compare/v4...v5)

[Compare
Source](https://redirect.github.com/actions/upload-artifact/compare/v4...v5)

</details>

---

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.github/workflows/build-cpp-runtime-bindings.yml

@@ -68,7 +68,7 @@ jobs:
           retention-days: 7  # Reduce retention due to size
 
       - name: Upload conda package artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: libsvs-runtime-conda${{ matrix.suffix }}
           path: conda-bld/linux-64/libsvs-runtime-*.conda