Use GMP 6.3.0, MPFR 4.2.1 in build-many-glibcs.py

[Joseph Myers]

This patch makes build-many-glibcs.py use the new GMP 6.3.0 and MPFR
4.2.1 releases.

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 fb56a4a90b..3082522140 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -803,10 +803,10 @@ class Context(object):
         default_versions = {'binutils': 'vcs-2.41',
                             'gcc': 'vcs-13',
                             'glibc': 'vcs-mainline',
-                            'gmp': '6.2.1',
+                            'gmp': '6.3.0',
                             'linux': '6.4',
                             'mpc': '1.3.1',
-                            'mpfr': '4.2.0',
+                            'mpfr': '4.2.1',
                             'mig': 'vcs-mainline',
                             'gnumach': 'vcs-mainline',
                             'hurd': 'vcs-mainline'}

-- 
Joseph S. Myers
joseph@codesourcery.com