consistently apply manylinux 2024 to Python <=3.9

rather than different pypy and cpython

Author: minrk

pyproject.toml

@@ -202,9 +202,9 @@ repair-wheel-command = """\
 "cmake.define.ZMQ_HAVE_IPC" = "OFF"
 "cmake.define.POLLER" = "select"
 
-# manylinux2014 for (less) old cp37-9, pp37-8
+# manylinux2014 for old Python <= 3.9
 [[tool.cibuildwheel.overrides]]
-select = "cp3{7,8,9}-* pp3{7,8}-*"
+select = "cp3{8,9}-* pp3{8,9}-*"
 manylinux-x86_64-image = "manylinux2014"
 manylinux-i686-image = "manylinux2014"