fix: sort import block to satisfy ruff isort (I001)

Move `from vss_tools.datatypes import Datatypes` before
`from vss_tools.main import get_trees` — alphabetical within
the vss_tools.* group as required by ruff/isort.

Co-Authored-By: Claude and aki1770-del <aki1770@gmail.com>

Author: aki1770-del

src/vss_tools/exporters/protobuf.py

@@ -18,14 +18,14 @@
 
 import vss_tools.cli_options as clo
 from vss_tools import log
+from vss_tools.datatypes import Datatypes
 from vss_tools.main import get_trees
 from vss_tools.model import (
     VSSData,
     VSSDataBranch,
     VSSDataDatatype,
     VSSDataStruct,
 )
-from vss_tools.datatypes import Datatypes
 from vss_tools.tree import VSSNode
 
 PATH_DELIMITER = "."