CI: skip 32-bit Windows wheel builds

The *i686 skip pattern in cibuildwheel config matches only Linux
32-bit identifiers (e.g. cp310-manylinux_i686), not Windows 32-bit
(which uses win32, e.g. cp310-win32). Add *win32 to skip 32-bit
Windows builds, which fail because:
- c_shard_info.c uses __uint128_t (GCC extension, unsupported by MSVC)
- cryptography test dependency fails to build for i686-pc-windows-msvc
  due to missing OpenSSL

Author: mykaul

pyproject.toml

@@ -142,6 +142,7 @@ skip = [
     "cp3*t-*",
     "pp3*t-*",
     "*i686",
+    "*win32",
     "*musllinux*",
 ]
 build = ["cp3*", "pp3*"]