Bump DF Java Python container tags (#35846)

Author: derrickaw

runners/google-cloud-dataflow-java/build.gradle

@@ -52,8 +52,8 @@ evaluationDependsOn(":sdks:java:container:java11")
 
 ext.dataflowLegacyEnvironmentMajorVersion = '8'
 ext.dataflowFnapiEnvironmentMajorVersion = '8'
-ext.dataflowLegacyContainerVersion = 'beam-master-20250729'
-ext.dataflowFnapiContainerVersion = 'beam-master-20250729'
+ext.dataflowLegacyContainerVersion = 'beam-master-20250811'
+ext.dataflowFnapiContainerVersion = 'beam-master-20250811'
 ext.dataflowContainerBaseRepository = 'gcr.io/cloud-dataflow/v1beta3'
 
 processResources {

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

@@ -34,6 +34,6 @@
 # Unreleased sdks use container image tag specified below.
 # 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-20250728'
+BEAM_DEV_SDK_CONTAINER_TAG = 'beam-master-20250811'
 
 DATAFLOW_CONTAINER_IMAGE_REPOSITORY = 'gcr.io/cloud-dataflow/v1beta3'