chore(deps): update dependency grpc.tools to 2.81.0

Author: github-actions[bot]

src/Leap.Testing/Leap.Testing.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="10.0.5" />
     <PackageReference Include="Google.Protobuf" Version="3.34.1" />
     <PackageReference Include="Grpc.Net.Client" Version="2.76.0" />
-    <PackageReference Include="Grpc.Tools" Version="2.78.0">
+    <PackageReference Include="Grpc.Tools" Version="2.81.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>