Remove the Python 37 environment from the tox.ini (#15693)

Remove the Python 37 environment from the `tox.ini` since Python 3.7 is
now end of life.

Co-authored-by: Alex Waygood <[email protected]>

Author: mbyrnepr2

tox.ini

@@ -2,10 +2,10 @@
 minversion = 4.4.4
 skip_missing_interpreters = {env:TOX_SKIP_MISSING_INTERPRETERS:True}
 envlist =
-    py37,
     py38,
     py39,
     py310,
+    py311,
     docs,
     lint,
     type,