remove 3.8 as not supported by numpy>=2

pyproject.toml

@@ -23,7 +23,7 @@ write_to_template = "__version__ = \"{version}\""
 [tool.cibuildwheel]
 test-requires = "pytest pillow"
 test-command = "pytest {project}/tests"
-build = "cp38-* cp39-* cp310-* cp311-* cp312-*"
+build = "cp39-* cp310-* cp311-* cp312-*"
 # skip musl and ignore the non-standard linux builds
 skip = "*-musllinux_* *s390x* *ppc64le* *i686*"
 build-frontend = "build"