Set GDB version number to 14.2.

This commit changes gdb/version.in to 14.2.
diff --git a/gdb/version.in b/gdb/version.in
index 17b5248..6b5bab0 100644
--- a/gdb/version.in
+++ b/gdb/version.in
@@ -1 +1 @@
-14.1.90.DATE-git
+14.2