update import path for AbstractDatasetTemplate to use base module

Author: tasansal

src/mdio/builder/formatting_html.py

@@ -11,7 +11,7 @@
 if TYPE_CHECKING:
     from mdio.builder.dataset_builder import MDIODatasetBuilder
     from mdio.builder.template_registry import TemplateRegistry
-    from mdio.builder.templates.abstract_dataset_template import AbstractDatasetTemplate
+    from mdio.builder.templates.base import AbstractDatasetTemplate
 
 
 @dataclass(frozen=True)