chore: Test on Python 3.12

Author: pawamoy

Makefile

@@ -1,7 +1,7 @@
 .DEFAULT_GOAL := help
 SHELL := bash
 DUTY := $(if $(VIRTUAL_ENV),,pdm run) duty
-export PDM_MULTIRUN_VERSIONS ?= 3.8 3.9 3.10 3.11
+export PDM_MULTIRUN_VERSIONS ?= 3.8 3.9 3.10 3.11 3.12
 
 args = $(foreach a,$($(subst -,_,$1)_args),$(if $(value $a),$a="$($a)"))
 check_quality_args = files