CMake: Fix error locating protobuf without Hunter

When protobuf 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:18 (find_package):
|   Could not find a package configuration file provided by "Protobuf" with any
|   of the following names:
|
|     ProtobufConfig.cmake
|     protobuf-config.cmake

Author: eigendude

cmake/dependencies.cmake

@@ -16,7 +16,7 @@ find_package(OpenSSL REQUIRED)
 
 # https://developers.google.com/protocol-buffers/
 hunter_add_package(Protobuf)
-find_package(Protobuf CONFIG REQUIRED)
+find_package(Protobuf REQUIRED)
 
 # https://docs.hunter.sh/en/latest/packages/pkg/spdlog.html
 hunter_add_package(spdlog)