[Fix] Delete unused __init__.py in mmdet3d/configs (#2773)

Author: sunjiahao1999

mmdet3d/__init__.py

@@ -14,8 +14,8 @@
 mmengine_maximum_version = '1.0.0'
 mmengine_version = digit_version(mmengine.__version__)
 
-mmdet_minimum_version = '3.0.0'
-mmdet_maximum_version = '3.2.0'
+mmdet_minimum_version = '3.0.0rc5'
+mmdet_maximum_version = '3.3.0'
 mmdet_version = digit_version(mmdet.__version__)
 
 assert (mmcv_version >= digit_version(mmcv_minimum_version)