chore(deps): update dependency go to v1.21.5 (#198)

Author: renovate-bot

go.mod

@@ -1,8 +1,6 @@
 module github.com/google/chrome-ssh-agent
 
-go 1.21.1
-
-toolchain go1.21.5
+go 1.21.5
 
 require (
 	github.com/google/go-cmp v0.6.0