Update go toolchain directive to v1.26.3

renovate[bot] · web-flow · commit 524e906ab06e · 2026-05-09T23:44:57.000Z
diff --git a/go.mod b/go.mod
@@ -2,7 +2,7 @@ module golift.io/xtractr
 
 go 1.25.7
 
-toolchain go1.26.1
+toolchain go1.26.3
 
 require (
 	github.com/Unpackerr/iso9660 v0.0.3
