fix: fixed failing test cases

on-behalf-of: @Mermaid-Chart <hello@mermaidchart.com>

packages/mermaid/src/diagrams/sequence/sequenceDiagram.ts

@@ -7,16 +7,10 @@ import { setConfig } from '../../diagram-api/diagramAPI.js';
 import renderer from './sequenceRenderer.js';
 import type { MermaidConfig } from '../../config.type.js';
 
-const db = new SequenceDB();
-parser.yy = {
-  parseMessage: db.parseMessage.bind(db),
-  matchAsActorOrParticipant: db.matchAsActorOrParticipant.bind(db),
-};
-
 export const diagram: DiagramDefinition = {
   parser,
   get db() {
-    return db;
+    return new SequenceDB();
   },
   renderer,
   styles,