chore: remove parentheses in 'sam local start-api' filter (#24513)

The dependencies in v1.76.0+ of the SAM CLI no longer contain parenthesis
in the output, making the trigger wait forever

packages/aws-cdk/test/integ/helpers/sam.ts

@@ -118,7 +118,7 @@ export class SamIntegrationTestFixture extends TestFixture {
     args.push('--port');
     args.push(port.toString());
 
-    return this.samShell(['sam', 'local', 'start-api', ...args], '(Press CTRL+C to quit)', ()=>{
+    return this.samShell(['sam', 'local', 'start-api', ...args], 'Press CTRL+C to quit', ()=>{
       return new Promise<ActionOutput>((resolve, reject) => {
         axios.get(`http://127.0.0.1:${port}${apiPath}`).then( resp => {
           resolve(resp.data);
@@ -242,4 +242,4 @@ function killSubProcess(child: child_process.ChildProcess, command: string) {
     child.kill('SIGINT');
   }
 
-}
+}