[CI] Migrate to rockylinux8 / manylinux_2_28_x86_64 (#10399)

* [CI] Migrate to rockylinux8 / manylinux_2_28_x86_64

* Scrub all references to CentOS 7

* Fix

* Remove use of yum

* Use gcc-10 in cpu

* Temporarily disable -Werror

* Use GCC 9 for now

* Roll back gRPC

* Scrub all references to manylinux2014_x86_64

* Revise rename_whl.py to handle no-op rename

* Change JDK_VERSION back to 8

* Reviewer's comment

* Use GCC 10

* Use Spark 3.5.1, same as in pom.xml

* Fix JAR install

tests/python/test_basic.py

@@ -244,7 +244,6 @@ class TestBasic:
         assert isinstance(cv, dict)
         assert len(cv) == (4)
 
-    @pytest.mark.skipif(**tm.skip_s390x())
     def test_cv_explicit_fold_indices_labels(self):
         params = {"max_depth": 2, "eta": 1, "objective": "reg:squarederror"}
         N = 100