chore(deps): update go toolchain directive to v1.26.3 [security]

renovate[bot] · web-flow · commit 8747076c444e · 2026-05-14T18:48:26.000Z
diff --git a/go.mod b/go.mod
@@ -2,7 +2,7 @@ module github.com/coreruleset/seclang_parser
 
 go 1.22
 
-toolchain go1.26.2
+toolchain go1.26.3
 
 require (
 	github.com/antlr4-go/antlr/v4 v4.13.1
