Update upgrade_manifest.py for DSE version 6.9.20

Author: bereng

upgrade_tests/upgrade_manifest.py

@@ -218,7 +218,7 @@ def clone_with_local_env_version(self):
 indev_dse_6_8 = VersionMeta(name='indev_dse_6_8', family=DSE_6_8, variant='indev', version='alias:bdp/6.8-dev', min_proto_v=3, max_proto_v=4, java_versions=(8,)) # FIXME also support proto_v=65+66 ("dse-v1" and "dse-v2")
 current_dse_6_8 = VersionMeta(name='current_dse_6_8', family=DSE_6_8, variant='current', version='6.8.63', min_proto_v=3, max_proto_v=4, java_versions=(8,)) # FIXME also support proto_v=65+66 ("dse-v1" and "dse-v2")
 indev_dse_6_9 = VersionMeta(name='indev_dse_6_9', family=DSE_6_8, variant='indev', version='alias:bdp/6.9-dev', min_proto_v=3, max_proto_v=4, java_versions=(11,)) # FIXME also support proto_v=65+66 ("dse-v1" and "dse-v2")
-current_dse_6_9 = VersionMeta(name='current_dse_6_9', family=DSE_6_8, variant='current', version='6.9.18', min_proto_v=3, max_proto_v=4, java_versions=(11,)) # FIXME also support proto_v=65+66 ("dse-v1" and "dse-v2")
+current_dse_6_9 = VersionMeta(name='current_dse_6_9', family=DSE_6_8, variant='current', version='6.9.20', min_proto_v=3, max_proto_v=4, java_versions=(11,)) # FIXME also support proto_v=65+66 ("dse-v1" and "dse-v2")
 
 indev_cc4 = VersionMeta(name='indev_cc4', family=CC4, variant='indev', version='github:datastax/main', min_proto_v=3, max_proto_v=4, java_versions=(11,))
 # TODO - HCD-128