chore(release): bump version

GitOrigin-RevId: 1da5b93cae57bff512c14c63fb723e1ea8c813c9

imperative/python/version_template.py

@@ -6,4 +6,4 @@
 # 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__ = "1.6.0.dev"
+__version__ = "1.7.0.dev"