Bump dependency Grpc.Tools to 2.68.1 (#6520)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Piotr Kiełkowicz <[email protected]>

Author: renovate[bot]

Directory.Packages.props

@@ -78,7 +78,7 @@
     <PackageVersion Include="GitHubActionsTestLogger" Version="2.4.1" />
     <PackageVersion Include="Grpc.AspNetCore" Version="2.59.0" />
     <PackageVersion Include="Grpc.AspNetCore.Server" Version="2.59.0" />
-    <PackageVersion Include="Grpc.Tools" Version="2.59.0" />
+    <PackageVersion Include="Grpc.Tools" Version="2.68.1" />
     <PackageVersion Include="Google.Protobuf" Version="3.22.5" />
     <PackageVersion Include="Grpc" Version="2.46.6" />
     <PackageVersion Include="Grpc.Net.Client" Version="2.52.0" />