gha: Merge artifacts on download

Turns out major versions break things.

Old behavior: Artifacts with same name are merged
New behavior: Artifacts with same name error

Using a pattern and merging on download should fix this at least on the
job-side. Though I do wonder if we'll start running into artifact limit
issues with the new way artifacts are handled...

.github/workflows/release.yml

@@ -30,26 +30,29 @@ jobs:
           fetch-depth: 0
 
       # try to get results from tests
-      - uses: dawidd6/action-download-artifact@v2
+      - uses: dawidd6/action-download-artifact@v6
         continue-on-error: true
         with:
           workflow: ${{github.event.workflow_run.name}}
           run_id: ${{github.event.workflow_run.id}}
-          name: sizes
+          pattern: '{sizes,sizes-*}'
+          merge-multiple: true
           path: sizes
-      - uses: dawidd6/action-download-artifact@v2
+      - uses: dawidd6/action-download-artifact@v6
         continue-on-error: true
         with:
           workflow: ${{github.event.workflow_run.name}}
           run_id: ${{github.event.workflow_run.id}}
-          name: cov
+          pattern: '{cov,cov-*}'
+          merge-multiple: true
           path: cov
-      - uses: dawidd6/action-download-artifact@v2
+      - uses: dawidd6/action-download-artifact@v6
         continue-on-error: true
         with:
           workflow: ${{github.event.workflow_run.name}}
           run_id: ${{github.event.workflow_run.id}}
-          name: bench
+          pattern: '{bench,bench-*}'
+          merge-multiple: true
           path: bench
 
       - name: find-version