Bump Grpc.Tools from 2.76.0 to 2.81.1 (#492)

---
updated-dependencies:
- dependency-name: Grpc.Tools
  dependency-version: 2.81.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/clustering/sharding-sqlserver/SqlSharding.Shared/SqlSharding.Shared.csproj

@@ -10,7 +10,7 @@
         <PackageReference Include="Akka.Cluster.Sharding" Version="$(AkkaVersion)" />
         <PackageReference Include="Akka.Cluster.Hosting" Version="$(AkkaHostingVersion)" />
         <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="$(MicrosoftExtensionsVersion)" />
-        <PackageReference Include="Grpc.Tools" Version="2.76.0">
+        <PackageReference Include="Grpc.Tools" Version="2.81.1">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>