build: Drop Python 3.7 and 3.8 support

We drop support for Python 3.7 and 3.8
because `typing.Annotated` is only available
in Python 3.9.

Author: pawamoy

Makefile

@@ -2,6 +2,7 @@
 SHELL := bash
 
 DUTY = $(shell [ -n "${VIRTUAL_ENV}" ] || echo pdm run) duty
+PYTHON_VERSIONS = 3.9 3.10 3.11
 
 args = $(foreach a,$($(subst -,_,$1)_args),$(if $(value $a),$a="$($a)"))
 check_quality_args = files
@@ -41,7 +42,7 @@ setup:
 
 .PHONY: check
 check:
-	@pdm multirun duty check-quality check-types check-docs
+	@pdm multirun -i 3.9,3.10,3.11 duty check-quality check-types check-docs
 	@$(DUTY) check-dependencies
 
 .PHONY: $(BASIC_DUTIES)
@@ -50,4 +51,4 @@ $(BASIC_DUTIES):
 
 .PHONY: $(QUALITY_DUTIES)
 $(QUALITY_DUTIES):
-	@pdm multirun duty $@ $(call args,$@)
+	@pdm multirun -i 3.9,3.10,3.11 duty $@ $(call args,$@)

pyproject.toml

@@ -8,7 +8,7 @@ description = "Griffe extension for @tiangolo's `typing.doc` PEP."
 authors = [{name = "Timothée Mazzucotelli", email = "pawamoy@pm.me"}]
 license = "ISC"
 readme = "README.md"
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 keywords = []
 dynamic = ["version"]
 classifiers = [
@@ -17,8 +17,6 @@ classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -70,10 +68,6 @@ maintain = [
     "git-changelog>=1.0",
 ]
 quality = [
-    # TODO: remove once importlib-metadata version conflict is resolved
-    "importlib-metadata<5; python_version < '3.8'",
-    "flake8>=4; python_version >= '3.8'",
-
     "darglint>=1.8",
     "flake8-bandit>=2.1",
     "flake8-black>=0.2",

scripts/setup.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -e
 
-PYTHON_VERSIONS="${PYTHON_VERSIONS-3.7 3.8 3.9 3.10 3.11}"
+PYTHON_VERSIONS="${PYTHON_VERSIONS-3.9 3.10 3.11}"
 
 if ! command -v pdm &>/dev/null; then
     if ! command -v pipx &>/dev/null; then