chore(deps): Bump Portable.System.DateTimeOnly from 8.0.2 to 9.0.0

Bumps [Portable.System.DateTimeOnly](https://github.com/OlegRa/System.DateTimeOnly) from 8.0.2 to 9.0.0.
- [Release notes](https://github.com/OlegRa/System.DateTimeOnly/releases)
- [Commits](OlegRa/System.DateTimeOnly@j8.0.2...j9.0.0)

---
updated-dependencies:
- dependency-name: Portable.System.DateTimeOnly
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

test/Riok.Mapperly.IntegrationTests/Riok.Mapperly.IntegrationTests.csproj

@@ -34,8 +34,8 @@
 
   <!-- ef core tests should only run on newer .NET versions -->
   <ItemGroup>
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.19" Condition="'$(TargetFramework)' == 'net7.0'" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.11" Condition="'$(TargetFramework)' == 'net8.0'" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.0" Condition="'$(TargetFramework)' == 'net7.0'" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.0" Condition="'$(TargetFramework)' == 'net8.0'" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.0" Condition="'$(TargetFramework)' == 'net9.0'" />
   </ItemGroup>
 
@@ -47,7 +47,7 @@
   <!-- cannot use source generated polyfills since they require language version 11 -->
   <ItemGroup Condition="'$(TargetFramework)' == 'net48'">
     <PackageReference Include="System.Collections.Immutable" Version="9.0.0" />
-    <PackageReference Include="Portable.System.DateTimeOnly" Version="8.0.2" />
+    <PackageReference Include="Portable.System.DateTimeOnly" Version="9.0.0" />
     <PackageReference Include="IsExternalInit" Version="1.0.3">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>