feat(docker): manage xgboost installation and version

feat(docker): manage xgboost installation and version

Pin xgboost as a managed build dependency, harmonized with the existing catboost/ngboost pattern: ARG xgboost_version in quickadapter/Dockerfile, matching build arg in docker-compose.yml, and automatic updates via the existing renovate custom regex manager (pypi datasource).

The freqtrade stable_freqai base image ships xgboost 3.2.0; this pins 3.4.1 so the QA and production images track the latest release independently of base image lag. ReforceXY is untouched: it does not use xgboost. BasedPyright snapshots unchanged (242/159 diagnostics verified with the rebuilt QA images).