BLD: newer versions of meson are pickier about types

Some versions of meson fail with the following error:

  ../pandas/_libs/meson.build:158:7: ERROR: python.extension_module keyword argument 'dependencies' was of type array[str] but should have been array[Dependency | InternalDependency]

Switching the default dependency list to [] rather than '' fixes the build.

Author: tacaswell

pandas/_libs/meson.build

@@ -160,7 +160,7 @@ foreach ext_name, ext_dict : libs_sources
         ext_dict.get('sources'),
         cython_args: cython_args,
         include_directories: [inc_np, inc_pd],
-        dependencies: ext_dict.get('deps', ''),
+        dependencies: ext_dict.get('deps', []),
         subdir: 'pandas/_libs',
         install: true,
     )

pandas/_libs/tslibs/meson.build

@@ -40,7 +40,7 @@ foreach ext_name, ext_dict : tslibs_sources
         ext_dict.get('sources'),
         cython_args: cython_args,
         include_directories: [inc_np, inc_pd],
-        dependencies: ext_dict.get('deps', ''),
+        dependencies: ext_dict.get('deps', []),
         subdir: 'pandas/_libs/tslibs',
         install: true,
     )