remove tests for python 3.6 and 3.7 to allow for compatibility with xgboost version 1.7.3

Author: djm21

.github/workflows/build-test-deploy.yml

@@ -21,13 +21,9 @@ jobs:
       LANG: en_US.UTF-8
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
         os-version: ['ubuntu-20.04', 'windows-latest', 'macos-latest']
         exclude:
-          - python-version: '3.6'
-            os-version: 'macos-latest'
-          - python-version: '3.7'
-            os-version: 'macos-latest'
 # Pinned Ubuntu version to 20.04 since no Python 3.6 builds available on ubuntu-latest (22.04) as of 2022-12-7.
 #        os-version: [ubuntu-latest, windows-latest, macos-latest]
 

tox.ini

@@ -12,16 +12,14 @@
 
 
 [tox]
-envlist = py{36,37,38,39,310,311,312}-tests-{clean,unit,integration}
+envlist = py{38,39,310,311,312}-tests-{clean,unit,integration}
 
 # Allow execution even if all Python versions are not present
 skip_missing_interpreters = {env:TOX_SKIP_MISSING_INTERPRETERS:True}
 
 # Required by tox-gh-actions GH action.  Maps GH Python runtime to tox envlist.
 [gh-actions]
 python =
-    3.6: py36
-    3.7: py37
     3.8: py38
     3.9: py39
     3.10: py310
@@ -33,8 +31,6 @@ skip_install =
     clean: true
 
 basepython =
-    py36: python3.6
-    py37: python3.7
     py38: python3.8
     py39: python3.9
     py310: python3.10