Use Linux 6.4 in build-many-glibcs.py

[Joseph Myers]

This patch makes build-many-glibcs.py use Linux 6.4.

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 95726c4a29..e022abe284 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -798,7 +798,7 @@ class Context(object):
                             'gcc': 'vcs-13',
                             'glibc': 'vcs-mainline',
                             'gmp': '6.2.1',
-                            'linux': '6.3',
+                            'linux': '6.4',
                             'mpc': '1.3.1',
                             'mpfr': '4.2.0',
                             'mig': 'vcs-mainline',

-- 
Joseph S. Myers
joseph@codesourcery.com