Bump golangci-lint to v1.24.0, linter fixes and general code improvements (#478)

* Bump golangci-lint version, update Go version deps and generic code improvements

* Fix wesbocket resp nil check and zip closures

* Update pprof path

database/drivers/sqlite3/sqlite3.go

@@ -10,7 +10,7 @@ import (
 )
 
 // Connect opens a connection to sqlite database and returns a pointer to database.DB
-func Connect() (*database.Db, error) {
+func Connect() (*database.Instance, error) {
 	if database.DB.Config.Database == "" {
 		return nil, database.ErrNoDatabaseProvided
 	}