Increment package version after release of azure-cosmos (#38607)

sdk/cosmos/azure-cosmos/CHANGELOG.md

@@ -1,5 +1,15 @@
 ## Release History
 
+### 4.9.1 (Unreleased)
+
+#### Features Added
+
+#### Breaking Changes
+
+#### Bugs Fixed
+
+#### Other Changes
+
 ### 4.9.0 (2024-11-18)
 
 #### Features Added

sdk/cosmos/azure-cosmos/azure/cosmos/_version.py

@@ -19,4 +19,4 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-VERSION = "4.9.0"
+VERSION = "4.9.1"