update java container version (#37756)

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-20260301'
-ext.dataflowFnapiContainerVersion = 'beam-master-20260301'
+ext.dataflowLegacyContainerVersion = 'beam-master-20260303'
+ext.dataflowFnapiContainerVersion = 'beam-master-20260303'
 ext.dataflowContainerBaseRepository = 'gcr.io/cloud-dataflow/v1beta3'
 
 processResources {