Update to Go 1.20 + run better align (#2927)

* chore(go): update go version to 1.20. Closes #2185

* chore(go): run better align against project

To optimize struct field order. Closes #2870

* chore(go): update CI jobs to use Go 1.20

* fix(go): linter warnings for Go 1.20 update

auth/fediverse/fediverse.go

@@ -13,11 +13,11 @@ import (
 
 // OTPRegistration represents a single OTP request.
 type OTPRegistration struct {
+	Timestamp       time.Time
 	UserID          string
 	UserDisplayName string
 	Code            string
 	Account         string
-	Timestamp       time.Time
 }
 
 // Key by access token to limit one OTP request for a person