Drop support for Python 3.8 and 3.9 versions

since ast implementation is incompatible with newer Python versions:
import alias AST node lacks mandatory lineno attribute.

Makefile

@@ -5,7 +5,7 @@ fix: format fixlint
 
 .venv:
 	pip install uv
-	uv venv -p 3.8 .venv
+	uv venv -p 3.10 .venv
 	uv pip sync requirements-dev.txt
 	uv pip install -e .[test]
 

pyproject.toml

@@ -6,15 +6,13 @@ authors = [
 ]
 description = "Find and remove dead code."
 readme = "README.md"
-requires-python = ">= 3.8"
+requires-python = ">= 3.10"
 classifiers = [
     "Development Status :: 3 - Alpha",
     "License :: OSI Approved :: GNU Affero General Public License v3",
     "Natural Language :: English",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -159,7 +157,7 @@ ignore = [
 
 [tool.mypy]
 exclude = ["build", "dist", ".venv"]
-python_version = "3.8"
+python_version = "3.10"
 strict = true
 pretty = true
 color_output = true
@@ -195,7 +193,7 @@ ignore_names = [
 ignore_names_in_files = [
     "deadcode/utils/base_test_case.py"
 ]
-exclude = ["tests*"]
+exclude = ["tests"]
 
 [tool.black]
 max_line_length = 120