Increase memory limit for dragonfly in docker-compose-db.yml

[sirouk]

Problem:
The dragonfly container exited.

Issue:

* For the available flags type dragonfly [--help | --helpfull]
* Documentation can be found at: https://www.dragonflydb.io/docs
W20241002 07:35:12.754663     1 dfly_main.cc:679] SWAP is enabled. Consider disabling it when running Dragonfly.
I20241002 07:35:12.754685     1 dfly_main.cc:703] Max memory limit is: 2.00GiB
W20241002 07:35:12.754709     1 dfly_main.cc:367] Weird error 1 switching to epoll
I20241002 07:35:12.833235     1 proactor_pool.cc:147] Running 48 io threads
E20241002 07:35:12.833262     1 dfly_main.cc:168] There are 48 threads, so 12.00GiB are required. Exiting...

Cause:
The service calculated the required memory and assessed the limit.

Fix:
Increase the memory limit.

[Fraccaman]

maybe we can just remove the --maxmemory option?

[sirouk]

Good call. I tested and it works fine without it. I pushed a commit 8bddb37👍which is now in this PR.