fix(test): remove duplicate word (#6456)

Signed-off-by: dufucun <[email protected]>

test/app.router.js

@@ -1156,7 +1156,7 @@ describe('app.router', function () {
     assert.strictEqual(app.get('/', function () { }), app)
   })
 
-  it('should should not use disposed router/middleware', function (done) {
+  it('should not use disposed router/middleware', function (done) {
     // more context: https://github.com/expressjs/express/issues/5743#issuecomment-2277148412
 
     var app = express();

test/res.format.js

@@ -237,7 +237,7 @@ function test(app) {
   })
 
   describe('when no match is made', function(){
-    it('should should respond with 406 not acceptable', function(done){
+    it('should respond with 406 not acceptable', function(done){
       request(app)
       .get('/')
       .set('Accept', 'foo/bar')