Reverted the Cecil version of Injector and Loader to continue supporting .NET 3.5

IPA.Injector/IPA.Injector.csproj

@@ -114,7 +114,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Mono.Cecil">
-      <Version>0.11.1</Version>
+      <Version>0.10.4</Version>
     </PackageReference>
     <PackageReference Include="SemanticVersioning">
       <Version>1.2.2</Version>

IPA.Loader/IPA.Loader.csproj

@@ -149,7 +149,7 @@
       <Version>1.2.0.1</Version>
     </PackageReference>
     <PackageReference Include="Mono.Cecil">
-      <Version>0.11.1</Version>
+      <Version>0.10.4</Version>
     </PackageReference>
     <PackageReference Include="Newtonsoft.Json">
       <Version>12.0.3</Version>