Build: Reduce the number of build jobs by disabling some old targets.

pyproject.toml

@@ -4,7 +4,21 @@ requires = ["Cython>=3.0.10", "setuptools", "wheel"]
 [tool.cibuildwheel]
 build-verbosity = 2
 environment = {STATIC_DEPS="true", LIBXML2_VERSION = "2.12.6", LIBXSLT_VERSION = "1.1.39"}
-skip = ["pp*-manylinux_i686", "*-musllinux_i686", "cp38_macosx_universal2"]
+skip = [
+    "pp*-manylinux_i686",
+    "*-musllinux_i686",
+    # Py3.8 wheel for macos is not universal: https://bugs.launchpad.net/lxml/+bug/2055404
+    "cp38_macosx_universal2",
+    # Reduce job load and HTTP hit rate on library servers.
+    "cp36-manylinux_aarch64",
+    "cp37-manylinux_aarch64",
+    "cp36-manylinux_ppc64le",
+    "cp37-manylinux_ppc64le",
+    "cp38-manylinux_ppc64le",
+    "cp36-manylinux_s390x",
+    "cp37-manylinux_s390x",
+    "cp38-manylinux_s390x",
+]
 # test-command = "python {package}/test.py -p -v"
 
 [tool.cibuildwheel.linux]