Bump actions/download-artifact from 4.1.5 to 4.1.8

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4.1.5 to 4.1.8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@8caf195...fa0a91b)

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

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

.github/workflows/build_test_cross.yml

@@ -250,7 +250,7 @@ jobs:
       with:
         egress-policy: audit
 
-    - uses: actions/download-artifact@8caf195ad4b1dee92908e23f56eeb0696f1dd42d # v4.1.5
+    - uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
       if: (matrix.shard_number < env.LAST_SHARD) && (env.WILL_RUN_TESTS == 'true')
       with:
         name: cross_binary-${{ matrix.identifier }}