Bump Grpc.Tools from 2.80.0 to 2.81.0 (#1269)

---
updated-dependencies:
- dependency-name: Grpc.Tools
  dependency-version: 2.81.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -67,7 +67,7 @@
   <!-- Serialization -->
   <ItemGroup>
     <PackageVersion Include="Google.Protobuf" Version="3.35.0" />
-    <PackageVersion Include="Grpc.Tools" Version="2.80.0" />
+    <PackageVersion Include="Grpc.Tools" Version="2.81.0" />
     <PackageVersion Include="YamlDotNet" Version="18.0.0" />
   </ItemGroup>
   <!-- Test dependencies -->