test: add django 41 into metrics

Author: goatwu1993

requirements/test-django41.txt

@@ -0,0 +1 @@
+django>=4.1.2,<4.2

tox.ini

@@ -10,13 +10,14 @@ python =
 DJANGO =
     3.2: django32
     4.0: django40
+    4.1: django41
 
 [tox]
 envlist =
     py37-django{32}
-    py38-django{32,40}
-    py39-django{32,40}
-    py310-django{32,40}
+    py38-django{32,40,41}
+    py39-django{32,40,41}
+    py310-django{32,40,41}
     pypy3-django{32}
     flake8
     apicheck
@@ -34,6 +35,7 @@ deps=
 
     django32: -r{toxinidir}/requirements/test-django32.txt
     django40: -r{toxinidir}/requirements/test-django40.txt
+    django41: -r{toxinidir}/requirements/test-django41.txt
 
     linkcheck,apicheck: -r{toxinidir}/requirements/docs.txt
     flake8,pydocstyle: -r{toxinidir}/requirements/pkgutils.txt