chore(deps): update go to v1.25.1

Author: renovate[bot]

go/dexop/go.mod

@@ -2,7 +2,7 @@ module github.com/rackerlabs/understack/go/dexop
 
 go 1.24.0
 
-toolchain go1.24.4
+toolchain go1.25.1
 
 require (
 	github.com/dexidp/dex/api/v2 v2.4.0