chore(deps): update dotnet monorepo to v9

Author: renovate[bot]

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "dotnet-ef": {
-      "version": "8.0.18",
+      "version": "9.0.8",
       "commands": [
         "dotnet-ef"
       ]

MumbleApi.Test/MumbleApi.Test.csproj

@@ -11,7 +11,7 @@
 
     <ItemGroup>
         <PackageReference Include="FluentAssertions" Version="8.5.0" />
-        <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.18" />
+        <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.8" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
         <PackageReference Include="xunit" Version="2.9.3" />
         <PackageReference Include="xunit.runner.visualstudio" Version="3.1.3">

MumbleApi/MumbleApi.csproj

@@ -15,10 +15,10 @@
       <PackageReference Include="Google.Cloud.Storage.V1" Version="4.13.0" />
       <PackageReference Include="Lib.AspNetCore.ServerSentEvents" Version="9.0.0" />
       <PackageReference Include="LinqKit" Version="1.3.8" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.18" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Abstractions" Version="8.0.18" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.18" PrivateAssets="All" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.18" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.8" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Abstractions" Version="9.0.8" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.8" PrivateAssets="All" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="9.0.8" />
       <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
       <PackageReference Include="Swashbuckle.AspNetCore" Version="9.0.3" />
       <PackageReference Include="Swashbuckle.AspNetCore.Annotations" Version="9.0.3" />