Bump Microsoft.Extensions.ObjectPool from 7.0.2 to 7.0.3 (#6401)

Bumps [Microsoft.Extensions.ObjectPool](https://github.com/dotnet/aspnetcore) from 7.0.2 to 7.0.3.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](https://github.com/dotnet/aspnetcore/commits)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.ObjectPool
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/core/Akka/Akka.csproj

@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup>
-      <PackageReference Include="Microsoft.Extensions.ObjectPool" Version="7.0.2" />
+      <PackageReference Include="Microsoft.Extensions.ObjectPool" Version="7.0.3" />
       <PackageReference Include="Newtonsoft.Json" Version="$(NewtonsoftJsonVersion)" />
       <PackageReference Include="System.Reflection.Emit" Version="4.7.0" />     
       <PackageReference Include="System.Collections.Immutable" Version="$(MicrosoftLibVersion)" />