build(deps): bump Microsoft.Extensions.Hosting.Abstractions in /src

Bumps [Microsoft.Extensions.Hosting.Abstractions](https://github.com/dotnet/runtime) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Hosting.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

src/Fluss.PostgreSQL/Fluss.PostgreSQL.csproj

@@ -15,7 +15,7 @@
 
     <ItemGroup>
         <PackageReference Include="FluentMigrator.Runner.Postgres" Version="5.2.0" />
-        <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="8.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="9.0.0" />
         <PackageReference Include="Npgsql" Version="9.0.2" />
         <PackageReference Include="Npgsql.Json.NET" Version="8.0.4" />
     </ItemGroup>

src/Fluss/Fluss.csproj

@@ -17,7 +17,7 @@
         <PackageReference Include="Collections.Pooled" Version="1.0.82" />
         <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
-        <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="8.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="9.0.0" />
         <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.1" />
         <PackageReference Include="Microsoft.Extensions.ObjectPool" Version="8.0.8" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.3"/>