Merge pull request MilesCranmer#497 from MilesCranmer/dependabot/github_actions/actions/download-artifact-5

chore(deps): bump actions/download-artifact from 4 to 5

Author: MilesCranmer

.github/workflows/CI.yml

@@ -102,7 +102,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Download all coverage artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           pattern: coverage-*
           path: coverage