Specify marker-pdf version behind the marker-api

Git log branch sperated with `marker` at commit `6f8b239c4a4811cb24cbaf8bb2e452ace9d99222 (tag: v0.2.5)`, but I saw some code of `marker:v0.2.12` commited by @adithya-s-k . Please show the marker version of each `savatar101/marker-api` image explicitly.
By the way, put the marker in dependencies and import would be better, than picking code from it manually again and again.