update Go to latest version (1.25) so that we have access to fs.SkipAll

We need fs.SkipAll (introduced in 1.20) so that we can skip WalkDir entirely
instead of just skipping the current directory. This is needed when we
encounter the "too many open files" error.

Author: bokwoon95

go.mod

@@ -1,8 +1,10 @@
 module github.com/bokwoon95/wgo
 
-go 1.16
+go 1.25
 
 require (
 	github.com/fsnotify/fsnotify v1.6.0
 	github.com/google/go-cmp v0.5.9
 )
+
+require golang.org/x/sys v0.0.0-20220908164124-27713097b956 // indirect