Fix Python 3.14 pathlib compatibility in nblint

PiperOrigin-RevId: 914344701

Author: lamberta

tools/tensorflow_docs/tools/nblint/style/gemini_cookbook.py

@@ -161,7 +161,7 @@ def split_path_on_dir(fp, dirname, offset=1):
     parts = fp.parts
     idx = parts.index(dirname)
     docs_dir = pathlib.Path(*parts[idx : idx + offset])
-    rel_path = fp.relative_to(*parts[: idx + offset])
+    rel_path = fp.relative_to(pathlib.Path(*parts[: idx + offset]))
     return docs_dir, rel_path
 
   if "site" in fp_full.parts:

tools/tensorflow_docs/tools/nblint/style/tensorflow.py

@@ -137,7 +137,7 @@ def split_path_on_dir(fp, dirname, offset=1):
     parts = fp.parts
     idx = parts.index(dirname)
     docs_dir = pathlib.Path(*parts[idx:idx + offset])
-    rel_path = fp.relative_to(*parts[:idx + offset])
+    rel_path = fp.relative_to(pathlib.Path(*parts[: idx + offset]))
     return docs_dir, rel_path
 
   if "site" in fp_full.parts: