Update python dev container tag (#37853)

* Update python dev container tag

* Update sdks/python/apache_beam/runners/dataflow/internal/names.py

---------

Co-authored-by: Claude <cvandermerwe@google.com>
Co-authored-by: tvalentyn <tvalentyn@users.noreply.github.com>

Author: 3 people

sdks/python/apache_beam/runners/dataflow/internal/names.py

@@ -35,6 +35,6 @@
 # Update this tag whenever there is a change that
 # requires changes to SDK harness container or SDK harness launcher.
 
-BEAM_DEV_SDK_CONTAINER_TAG = 'beam-master-20260309'
+BEAM_DEV_SDK_CONTAINER_TAG = 'beam-master-20260316'
 
 DATAFLOW_CONTAINER_IMAGE_REPOSITORY = 'gcr.io/cloud-dataflow/v1beta3'