Fix(Dropdown): Made the titleText required property (#17854)

* fix(Dropdown): made the titleText optional in propTypes

* docs(Contributors): updated the contributors list

* fix(Dropdown): added back the isrequired property

.all-contributorsrc

@@ -1688,6 +1688,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "Thamjith",
+      "name": "Thamjith Thaha",
+      "avatar_url": "https://avatars.githubusercontent.com/u/24909620?v=4",
+      "profile": "https://github.com/Thamjith",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "commitConvention": "none"

README.md

@@ -311,6 +311,7 @@ check out our [Contributing Guide](/.github/CONTRIBUTING.md) and our
     <td align="center"><a href="https://github.com/soumyaraju"><img src="https://avatars.githubusercontent.com/u/41182657?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Soumya Raju</b></sub></a><br /><a href="https://github.com/carbon-design-system/carbon/commits?author=soumyaraju" title="Code">💻</a></td>
     <td align="center"><a href="https://irfadkp.github.io/"><img src="https://avatars.githubusercontent.com/u/54243898?v=4?s=100" width="100px;" alt=""/><br /><sub><b>IRFAD KP</b></sub></a><br /><a href="https://github.com/carbon-design-system/carbon/commits?author=irfadkp" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/ziyadzulfikar"><img src="https://avatars.githubusercontent.com/u/56788667?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ziyad Bin Sulfi</b></sub></a><br /><a href="https://github.com/carbon-design-system/carbon/commits?author=ziyadzulfikar" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/Thamjith"><img src="https://avatars.githubusercontent.com/u/24909620?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Thamjith Thaha</b></sub></a><br /><a href="https://github.com/carbon-design-system/carbon/commits?author=Thamjith" title="Code">💻</a></td>
   </tr>
   <tr>
     <td align="center"><a href="https://irfadkp.github.io/"><img src="https://avatars.githubusercontent.com/u/54243898?v=4?s=100" width="100px;" alt=""/><br /><sub><b>IRFAD KP</b></sub></a><br /><a href="https://github.com/carbon-design-system/carbon/commits?author=irfadkp" title="Code">💻</a></td>