fix: Append two additional facts to the graylist

* Card ID: CCT-1023

This update appends two additional CPU-related facts to the graylist.
The graylist currently includes `cpu.cpu_mhz` and `lscpu.cpu_mhz`, but
RHEL 9.6 and 10.0 add more CPU facts that also vary frequently.

src/rhsmlib/facts/collection.py

@@ -22,7 +22,7 @@ class FactsDict(collections.abc.MutableMapping):
     """A dict for facts that ignores items in 'graylist' on compares."""
 
     GRAYLIST = set(
-        ["cpu.cpu_mhz", "lscpu.cpu_mhz"]
+        ["cpu.cpu_mhz", "lscpu.cpu_mhz", "proc_cpuinfo.common.cpu_mhz", "lscpu.cpu(s)_scaling_mhz"]
     )
 
     def __init__(self, *args, **kwargs):