update calls plugin to v0.20.0 (#24729)

server/Makefile

@@ -161,7 +161,7 @@ PLUGIN_PACKAGES ?= $(PLUGIN_PACKAGES:)
 PLUGIN_PACKAGES += mattermost-plugin-antivirus-v1.0.0
 PLUGIN_PACKAGES += mattermost-plugin-autolink-v1.4.0
 PLUGIN_PACKAGES += mattermost-plugin-aws-SNS-v1.2.0
-PLUGIN_PACKAGES += mattermost-plugin-calls-v0.19.1
+PLUGIN_PACKAGES += mattermost-plugin-calls-v0.20.0
 PLUGIN_PACKAGES += mattermost-plugin-channel-export-v1.0.0
 PLUGIN_PACKAGES += mattermost-plugin-confluence-v1.3.0
 PLUGIN_PACKAGES += mattermost-plugin-custom-attributes-v1.3.1