build: set deps default build type to Release (#27495)

Debugging dependencies is rare so a Debug build type is usually not
needed. In cases where it _is_ needed it is easy to rebuild in Debug
mode. But since Release builds are more common, it makes more sense as a
default.

For Neovim itself we stick with a Debug build as a default, since
rebuilding and debugging is done _much_ more frequently than with
dependencies (which we _mostly_ expect to "just work").

Also remove the CMAKE_BUILD_TYPE variable in the Makefile, since this is
set by default in CMake.

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