SDK/dependency updates

Author: nblumhardt

appveyor.yml

@@ -1,4 +1,4 @@
-version: 2023.3.{build}
+version: 2023.4.{build}
 skip_tags: true
 image:
 - Visual Studio 2022

global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "7.0.305"
+    "version": "7.0.400"
   }
 }

src/SeqCli/SeqCli.csproj

@@ -38,8 +38,8 @@
     <PackageReference Include="Superpower" Version="3.0.0" />
     <PackageReference Include="System.Reactive" Version="6.0.0" />
     <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="7.0.1" />
-    <PackageReference Include="Seq.Api" Version="2023.3.0" />
-    <PackageReference Include="Seq.Apps" Version="2021.4.0" />
+    <PackageReference Include="Seq.Api" Version="2023.4.0" />
+    <PackageReference Include="Seq.Apps" Version="2023.4.0" />
     <PackageReference Include="Tavis.UriTemplates" Version="2.0.0" />
   </ItemGroup>
   <ItemGroup>