Update dotnet.yaml

Bump `actions/upload-artifact` to v4

Author: nitz

.github/workflows/dotnet.yaml

@@ -78,7 +78,7 @@ jobs:
     ####################################### STORE #######################################
 
     - name: Store Package Artifacts
-      uses: actions/upload-artifact@v2.2.2
+      uses: actions/upload-artifact@v4
       with:
         name: NuGet Packages
         path: |
@@ -87,7 +87,7 @@ jobs:
         retention-days: 7
 
     - name: Store Binary Artifacts
-      uses: actions/upload-artifact@v2.2.2
+      uses: actions/upload-artifact@v4
       with:
         name: Library Binaries
         path: |