TUN-7584: Bump go 1.20.6

Pins all docker and cfsetup builds to a specific go patch version.
Also ran go fix on repo.

cmd/cloudflared/generic_service.go

@@ -1,5 +1,4 @@
 //go:build !windows && !darwin && !linux
-// +build !windows,!darwin,!linux
 
 package main
 

cmd/cloudflared/linux_service.go

@@ -1,5 +1,4 @@
 //go:build linux
-// +build linux
 
 package main
 

cmd/cloudflared/macos_service.go

@@ -1,5 +1,4 @@
 //go:build darwin
-// +build darwin
 
 package main
 

cmd/cloudflared/tunnel/configuration_test.go

@@ -1,5 +1,4 @@
 //go:build ignore
-// +build ignore
 
 // TODO: Remove the above build tag and include this test when we start compiling with Golang 1.10.0+
 

cmd/cloudflared/tunnel/signal_test.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package tunnel
 

cmd/cloudflared/updater/workers_service_test.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package updater
 

cmd/cloudflared/windows_service.go

@@ -1,5 +1,4 @@
 //go:build windows
-// +build windows
 
 package main