Minimum RHEL 9 is now 9.6

[pshipton]

Issue or pull request number:
N/A

Overview:
The minimum level for RHEL 9 is now 9.6.
RHEL 9.4 went out of Extended Update Support (EUS) on April 30, 2026.

Release target:
0.60

Applies to the following JDK versions:
All

Applies to the following platforms:
Linux