Upgrade XGBoost requirement to >=1.4.2

[angela97lin]

Closes #2497

I noticed the error disappeared with 1.4.2. Digging further: https://stackoverflow.com/questions/67095097/xgboosterror-check-failed-typestr-size-3-2-vs-3-typestr-should-be, the fix was added in 1.4.2: dmlc/xgboost#6927

[codecov]

Codecov Report

Merging #2498 (8134c7a) into main (e929f22) will not change coverage.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main   #2498   +/-   ##
=====================================
  Coverage   99.7%   99.7%           
=====================================
  Files        283     283           
  Lines      25585   25585           
=====================================
  Hits       25483   25483           
  Misses       102     102           

Impacted Files	Coverage Δ
.../automl_tests/test_automl_search_classification.py	100.0% <100.0%> (ø)
...ests/automl_tests/test_automl_search_regression.py	100.0% <100.0%> (ø)

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[angela97lin]

Updating this test to max_batches = 1, and then checking that none of the cv scores is None. This way, XGBoost is run and if the cv score is none (aka xgboost errors), we catch it here! Run with XGBoost == 1.4.0 to see an error :)

[freddyaboulton]

So with this change, this test would fail on main right now?

[angela97lin]

@freddyaboulton With this change and xgboost == 1.4.0, this would fail. However, since we don't cap XGBoost, we install >=1.4.2 which passes :)

[freddyaboulton]

Looks good to me! Thanks @angela97lin