chore(release): bump version

GitOrigin-RevId: db62cc3899f3532fe79712c38b8bca5c8d09e440

imperative/python/version_template.py

@@ -6,5 +6,5 @@
 # Unless required by applicable law or agreed to in writing,
 # software distributed under the License is distributed on an
 # "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-__version__ = "1.3.0.dev"
+__version__ = "1.4.0.dev"