CMake: Fix error locating Boost DI without Hunter

When Boost-DI is provided by the build system, it may use a CMake Find module
instead of a package configuration file.

Error was:

| CMake Error at cmake/dependencies.cmake:30 (find_package):
|   Could not find a package configuration file provided by "Boost.DI" with any
|   of the following names:
|
|     Boost.DIConfig.cmake
|     boost.di-config.cmake

Author: eigendude

cmake/dependencies.cmake

@@ -28,4 +28,4 @@ find_package(tsl_hat_trie CONFIG REQUIRED)
 
 # https://github.com/masterjedy/di
 hunter_add_package(Boost.DI)
-find_package(Boost.DI CONFIG REQUIRED)
+find_package(Boost.DI REQUIRED)