DEV: correct python version in tools

pyproject.toml

@@ -8,7 +8,6 @@ authors = [
     { name = "Lucas Colley", email = "[email protected]" },
     { name = "Open Source Contributors" },
 ]
-
 description = "Extra array functions that aren't in the array API standard, implemented in terms of the standard."
 readme = "README.md"
 license.file = "LICENSE"
@@ -147,7 +146,7 @@ report.exclude_also = [
 
 [tool.mypy]
 files = ["src", "tests"]
-python_version = "3.8"
+python_version = "3.9"
 warn_unused_configs = true
 strict = true
 enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]
@@ -164,6 +163,7 @@ disallow_incomplete_defs = true
 # Ruff
 
 [tool.ruff]
+target-version = "py39"
 
 [tool.ruff.lint]
 extend-select = [
@@ -203,7 +203,7 @@ isort.required-imports = ["from __future__ import annotations"]
 # Pylint
 
 [tool.pylint]
-py-version = "3.8"
+py-version = "3.9"
 ignore-paths = [".*/_version.py"]
 reports.output-format = "colorized"
 similarities.ignore-imports = "yes"