gdb: update IRC reference from Freenode to Libera.Chat

It's been some time since the switch from Freenode to Libera.Chat,
however, there's still a reference to Freenode in the 'gdb --help'
output.  Lets update that.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/main.c b/gdb/main.c
index 47eec0e..3e93f58 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -1484,5 +1484,5 @@ Report bugs to %ps.\n\
   if (stream == gdb_stdout)
     gdb_printf (stream, _("\n\
 You can ask GDB-related questions on the GDB users mailing list\n\
-(gdb@sourceware.org) or on GDB's IRC channel (#gdb on Freenode).\n"));
+(gdb@sourceware.org) or on GDB's IRC channel (#gdb on Libera.Chat).\n"));
 }