[gcc r15-11273] Bump BASE-VER

[Richard Biener]

https://gcc.gnu.org/g:d444edf9d88dda5bc87758bc40b7ddab81e1a5dd

commit r15-11273-gd444edf9d88dda5bc87758bc40b7ddab81e1a5dd
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Jun 12 08:13:52 2026 +0200

    Bump BASE-VER
    
            * BASE-VER: Set to 15.3.1.

Diff:
---
 gcc/BASE-VER | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/BASE-VER b/gcc/BASE-VER
index 5ff58dbcd684..2d67a9de19a0 100644
--- a/gcc/BASE-VER
+++ b/gcc/BASE-VER
@@ -1 +1 @@
-15.3.0
+15.3.1