Makefile: Update for 2026.05.3

Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

Makefile

diff --git a/Makefile b/Makefile
index e3dd635..b86b84f 100644
--- a/Makefile
+++ b/Makefile
@@ -92,9 +92,9 @@
 .PHONY: all
 
 # Set and export the version string
-export BR2_VERSION := 2026.05.2
+export BR2_VERSION := 2026.05.3
 # Actual time the release is cut (for reproducible builds)
-BR2_VERSION_EPOCH = 1787518800
+BR2_VERSION_EPOCH = 1789069200
 
 # Save running make version since it's clobbered by the make package
 RUNNING_MAKE_VERSION := $(MAKE_VERSION)