Fix tox testenv generative name

dj32 was inadvertently removed from the -postgresql testenv section.

Author: living180

tox.ini

@@ -42,7 +42,7 @@ whitelist_externals = make
 pip_pre = True
 commands = python -b -W always -m coverage run -m django test -v2 {posargs:tests}
 
-[testenv:py{37,38,39,310}-dj{40,41,main}-postgresql]
+[testenv:py{37,38,39,310}-dj{32,40,41,main}-postgresql]
 setenv =
     {[testenv]setenv}
     DB_BACKEND = postgresql