Update dependency angular.js to v1.8.3

Author: renovate[bot]

src/lib/angular-material-datetimepicker/index.html

@@ -124,9 +124,9 @@ <h2>
   </md-card>
 </md-content>
 
-<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular.min.js"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular-animate.min.js"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular-aria.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular-animate.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular-aria.min.js"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-material/1.1.3/angular-material.min.js"></script>
 <script type="text/javascript"
         src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment-with-locales.min.js"></script>