Address GH code scanning (#773)

https://github.com/PeerDB-io/peerdb/security/code-scanning/3

GH doesn't like converting Itoa result to smaller integer
Ports are 16 bit unsigned integers, so parse as 16 bit unsigned integer

flow/e2e/sqlserver/sqlserver_helper.go

@@ -23,7 +23,7 @@ type SQLServerHelper struct {
 }
 
 func NewSQLServerHelper(name string) (*SQLServerHelper, error) {
-	port, err := strconv.Atoi(os.Getenv("SQLSERVER_PORT"))
+	port, err := strconv.ParseUint(os.Getenv("SQLSERVER_PORT"), 10, 16)
 	if err != nil {
 		return nil, fmt.Errorf("invalid SQLSERVER_PORT: %s", os.Getenv("SQLSERVER_PORT"))
 	}