Stop testing unsupported Python 3.8 and 3.9

That's what was breaking CI. The alternative would be:
	from __future__ import annotations

Author: DimitriPapadopoulos

tox.ini

@@ -35,38 +35,6 @@ commands =
 deps =
     ruff
 
-[testenv:py38]
-basepython = python3.8
-commands = pytest -v --doctest-modules --ignore benchmark --doctest-glob="README.md" {posargs}
-deps =
-    pytest
-
-[testenv:py38-extra]
-basepython = python3.8
-commands = pytest -v --doctest-modules --ignore benchmark --doctest-glob="README.md" {posargs}
-deps =
-    pytest
-    numpy
-    pandas
-    wcwidth
-
-
-[testenv:py39]
-basepython = python3.9
-commands = pytest -v --doctest-modules --ignore benchmark --doctest-glob="README.md" {posargs}
-deps =
-    pytest
-
-[testenv:py39-extra]
-basepython = python3.9
-commands = pytest -v --doctest-modules --ignore benchmark --doctest-glob="README.md" {posargs}
-deps =
-    pytest
-    numpy
-    pandas
-    wcwidth
-
-
 [testenv:py310]
 basepython = python3.10
 commands = pytest -v --doctest-modules --ignore benchmark --doctest-glob="README.md" {posargs}