[auto-trainer] update test requirements (#839)

* [Build] Fix html links, Add <function>.html as source in documentation

* Update CI temporarily and update index

* [XGB-Custom] Fix test artifact key name

* [XGB-Serving][XGB-Test][XGB-Trainer] Fix tests - artifact key

* [Build] Install python 3.9 when testing (#618)

* [Build] Update python version in CI (#620)

* [Build] Install python 3.9 when testing

* [Build] Update python version in CI

* .

* Revert "[Build] Update python version in CI (#620)" (#621)

This reverts commit 0cd1f15.

* Revert "[Build] Install python 3.9 when testing (#618)" (#619)

This reverts commit 3301415.

* [Build] Build with python 3.9 (#622)

* [Build] Build with python 3.9

* .

* Update requirements.txt

auto_trainer/requirements.txt

@@ -1,4 +1,4 @@
 pandas
-scikit-learn
-xgboost
-plotly
+scikit-learn<1.4.0
+xgboost<2.0.0
+plotly