Use MPFR 4.2.2 and Linux 6.14 in build-many-glibcs.py

[Joseph Myers]

Tested with build-many-glibcs.py (host-libraries, compilers and glibcs
builds).

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index 07c10e4cfd..28258e372c 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -831,9 +831,9 @@ class Context(object):
                             'gcc': 'vcs-14',
                             'glibc': 'vcs-mainline',
                             'gmp': '6.3.0',
-                            'linux': '6.13',
+                            'linux': '6.14',
                             'mpc': '1.3.1',
-                            'mpfr': '4.2.1',
+                            'mpfr': '4.2.2',
                             'mig': 'vcs-mainline',
                             'gnumach': 'vcs-mainline',
                             'hurd': 'vcs-mainline'}

-- 
Joseph S. Myers
josmyers@redhat.com