chore(deps): update go to 1.26.1

Author: renovate-vince-riv[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/vince-riv/argo-diff
 
 go 1.25.0
 
-toolchain go1.25.7
+toolchain go1.26.1
 
 require (
 	github.com/akedrou/textdiff v0.1.0