chore(deps): update actions/download-artifact action to v4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -42,15 +42,15 @@ jobs:
         uses: actions/checkout@v4
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: Code coverage ubuntu-latest
           path: coverage-ubuntu
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: Code coverage windows-latest
           path: coverage-windows
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: Code coverage macos-latest
           path: coverage-macos
@@ -103,7 +103,7 @@ jobs:
           fetch-depth: 0
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: NuGet packages
           path: packages