Bump RestSharp from 106.15.0 to 112.1.0

Bumps [RestSharp](https://github.com/restsharp/RestSharp) from 106.15.0 to 112.1.0.
- [Release notes](https://github.com/restsharp/RestSharp/releases)
- [Commits](restsharp/RestSharp@106.15.0...112.1.0)

---
updated-dependencies:
- dependency-name: RestSharp
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/dnsimple-test/dnsimple-test.csproj

@@ -602,7 +602,7 @@
     </PackageReference>
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="RestSharp" Version="106.15.0" />
+    <PackageReference Include="RestSharp" Version="112.1.0" />
   </ItemGroup>
 
   <ItemGroup>

src/dnsimple/dnsimple.csproj

@@ -31,7 +31,7 @@
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="RestSharp" Version="106.15.0" />
+    <PackageReference Include="RestSharp" Version="112.1.0" />
   </ItemGroup>
 
 </Project>