ci: drop building i686 packages

Not supported out-of-the-box anymore by cibuildwheel. Will bother to fix it if requested.

Author: dvarrazzo

.github/workflows/packages.yml

@@ -65,7 +65,7 @@ jobs:
  fail-fast: false
  matrix:
  platform: [manylinux, musllinux]
- arch: [x86_64, i686, aarch64, ppc64le]
+ arch: [x86_64, aarch64, ppc64le]
  pyver: [cp38, cp39, cp310, cp311, cp312, cp313]
 
  runs-on: ubuntu-latest