fix(keras): compatibility with Keras 3.4.0 (#4922)

* Fix keras.save_model compatibility with Keras 3

Compatibility was lost with Keras 3. This restore the functionality
when using Keras 3.4.0 or newer.

Fix #4921

* ci: auto fixes from pre-commit.ci

For more information, see https://pre-commit.ci

* Adjust framework dependency version for Keras

* Fix minimal version check

* Add compatibility with older keras 2.x version

* ci: auto fixes from pre-commit.ci

For more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

noxfile.py

@@ -27,7 +27,7 @@
         "jaxlib; platform_system!='Windows'",
         "chex; platform_system!='Windows'",
     ],
-    "keras": ["keras"],
+    "keras": ["keras>=3.4"],
     "lightgbm": ["lightgbm"],
     "onnx": ["onnx", "onnxruntime", "skl2onnx"],
     "picklable_model": [],

src/bentoml/_internal/frameworks/keras.py

@@ -269,7 +269,15 @@ def KerasSequentialModel() -> keras.models.Model:
         metadata=metadata,
         signatures=signatures,
     ) as bento_model:
-        model.save(bento_model.path, include_optimizer=include_optimizer, **kwargs)
+        if keras.__version__ >= "3.4.0":
+            model.save(
+                bento_model.path,
+                zipped=False,
+                include_optimizer=include_optimizer,
+                **kwargs,
+            )
+        else:
+            model.save(bento_model.path, include_optimizer=include_optimizer, **kwargs)
 
         return bento_model