XGB Regressor (#7107)

* Fixes: #{6551}

* Fixes: #{6551}

* Update xgboostclassifier.py

* Delete xgboostclassifier.py

* Update xgboostregressor.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fixes: #{6551}

* Fixes : {#6551}

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fixes: {#6551]

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update xgboostregressor.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update xgboostregressor.py

* Update xgboostregressor.py

* Fixes: { #6551}

* Update xgboostregressor.py

* Fixes: { #6551}

* Fixes: { #6551}

* Update and rename xgboostregressor.py to xgboost_regressor.py

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>