build(deps): Update Refit requirement from 6.* to 7.*

Updates the requirements on [Refit](https://github.com/reactiveui/refit) to permit the latest version.
- [Release notes](https://github.com/reactiveui/refit/releases)
- [Commits](reactiveui/refit@v6.0.1...7.0.0)

---
updated-dependencies:
- dependency-name: Refit
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Xamarin/Cinephile/Cinephile.Core/Cinephile.Core.csproj

@@ -1,10 +1,10 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="akavache" Version="9.*" />
-    <PackageReference Include="Refit" Version="6.*" />
+    <PackageReference Include="Refit" Version="7.*" />
     <PackageReference Include="Fusillade" Version="2.*" />
     <PackageReference Include="System.Reactive.Compatibility" Version="6.0.0" />
     <PackageReference Include="DynamicData" Version="7.*" />