CI: Use manylinux_2_28 for 32 bit tests job

Author: mroeschke

.github/workflows/unit-tests.yml

@@ -216,7 +216,7 @@ jobs:
   Linux-32-bit:
     runs-on: ubuntu-24.04
     container:
-      image: quay.io/pypa/manylinux2014_i686
+      image: quay.io/pypa/manylinux_2_28_i686
       options: --platform linux/386
     steps:
       - name: Checkout pandas Repo