[VOL-5491] upgrade go to 1.25.3 and golangci-lint version to 2.5.0

Signed-off-by: mgouda <madhumati.gouda@radisys.com>
Change-Id: I741fcf658ffdd127b897e5fa8cc57da6c9926e7e
diff --git a/VERSION b/VERSION
index 195a8c7..1a79ceb 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.5.20
+4.5.21