spec(test): DragonflyDBのフラグ見直し (MisskeyIO#977)

.devcontainer/docker-compose.yml

@@ -23,13 +23,7 @@ services:
     environment:
       DFLY_snapshot_cron: '* * * * *'
       DFLY_version_check: false
-      DFLY_tcp_backlog: 2048
       DFLY_default_lua_flags: allow-undeclared-keys
-      DFLY_pipeline_squash: 0
-      DFLY_multi_exec_squash: false
-      DFLY_conn_io_threads: 4
-      DFLY_epoll_file_threads: 4
-      DFLY_proactor_threads: 4
     networks:
       - internal_network
     volumes: