go.mod: bump to Go 1.24.4

and use this opportunity to bust the cache.
good to do every once in a while.
diff --git a/go.mod b/go.mod
index 8f7cc4b..363a739 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module sketch.dev
 
-go 1.24.3
+go 1.24.4
 
 require (
 	github.com/chromedp/cdproto v0.0.0-20250403032234-65de8f5d025b