Fix incorrect version reference in documentation for azure/trusted-signing-action (#48)

fix: correct version reference to v0.4.0 in documentation

Author: teamchong

README.md

@@ -38,7 +38,7 @@ jobs:
         run: dotnet build --configuration Release --no-restore WpfApp
 
       - name: Sign files with Trusted Signing
-        uses: azure/trusted-signing-action@v0.4.1
+        uses: azure/trusted-signing-action@v0.4.0
         with:
           azure-tenant-id: ${{ secrets.AZURE_TENANT_ID }}
           azure-client-id: ${{ secrets.AZURE_CLIENT_ID }}