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

models/federatedActivity.go

@@ -5,8 +5,8 @@ import "time"
 // FederatedActivity is an internal representation of an activity that was
 // accepted and stored.
 type FederatedActivity struct {
+	Timestamp time.Time `json:"timestamp"`
 	IRI       string    `json:"iri"`
 	ActorIRI  string    `json:"actorIRI"`
 	Type      string    `json:"type"`
-	Timestamp time.Time `json:"timestamp"`
 }