Bump actions/download-artifact from 6 to 7 (CommunityToolkit#3005)

Author: dependabot[bot]

.github/workflows/dotnet-build.yml

@@ -284,13 +284,13 @@ jobs:
                     dotnet-quality: 'ga'
 
             -   name: Download NuGet List
-                uses: actions/download-artifact@v6
+                uses: actions/download-artifact@v7
                 with:
                     name: nuget-list
                     path: ./
 
             -   name: Download Package List
-                uses: actions/download-artifact@v6
+                uses: actions/download-artifact@v7
                 with:
                     name: packages
                     path: ./packages
@@ -356,7 +356,7 @@ jobs:
                     dotnet-quality: 'ga'
 
             -   name: Download signed packages
-                uses: actions/download-artifact@v6
+                uses: actions/download-artifact@v7
                 with:
                     name: signed-packages
                     path: ./packages
@@ -384,7 +384,7 @@ jobs:
                     dotnet-quality: 'ga'
 
             -   name: Download signed packages
-                uses: actions/download-artifact@v6
+                uses: actions/download-artifact@v7
                 with:
                     name: signed-packages
                     path: ./packages