[keyserver] upgrade docker keyserver MariaDB from 10.8 to 10.11

Summary: This upgrades the docker keyserver MariaDB from 10.8 to 10.11

Test Plan: ran docker compose up and verified mariadb-upgrade was successfully run

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D12081