fix(ci): pin deps to Go 1.21 and remove unused func (was breaking lint/test)

go.mod

@@ -1,17 +1,17 @@
 module git.dracodev.net/Projets/clip-sync
 
-go 1.25
+go 1.21
 
 require (
 	github.com/BurntSushi/toml v1.3.2
-	github.com/hashicorp/mdns v1.0.7
+	github.com/hashicorp/mdns v1.0.6
 )
 
 require (
-	github.com/miekg/dns v1.1.72 // indirect
-	golang.org/x/mod v0.31.0 // indirect
-	golang.org/x/net v0.48.0 // indirect
-	golang.org/x/sync v0.19.0 // indirect
-	golang.org/x/sys v0.39.0 // indirect
-	golang.org/x/tools v0.40.0 // indirect
+	github.com/miekg/dns v1.1.55 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.34.0 // indirect
+	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
 )