Update actions/download-artifact action to v8

skip-release-and-release-note: true
GitOrigin-RevId: d7a0bab005e3cb2312fe84bad0dfd664b2ba8301

Author: Octobob

.github/workflows/main.yaml

@@ -197,7 +197,7 @@ jobs:
           fetch-depth: 0 # fetching everything is unfortunately required to get tags
 
       - name: Download nuget package artifact
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: OctoClientsNuget
           path: ./artifacts/