Corrects sonarqube issues

src/app/core/components/main/footer/footer.component.html

@@ -4,19 +4,19 @@
       <ul>
         <li>
           <a href="http://www.facebook.com/legrandlyon" title="Facebook (new window)" i18n-title="@@footer.facebook"
-            target="_blank" rel="noopener">
+            target="_blank" rel="noopener noreferrer">
             <img class="social-network-link" src="./assets/img/icon_fb.svg" i18n-alt="@@footer.facebook" alt="Facebook (new window)">
           </a>
         </li>
         <li class="left-border">
           <a href="https://twitter.com/grandlyon" title="Twitter (new window)" i18n-title="@@footer.twitter"
-            target="_blank" rel="noopener">
+            target="_blank" rel="noopener noreferrer">
             <img class="social-network-link" src="./assets/img/icon_twi.svg" i18n-alt="@@footer.twitter" alt="Twitter (new window)">
           </a>
         </li>
         <li class="left-border">
           <a href="https://download.data.grandlyon.com/catalogue/srv/fre/rss.search?sortBy=publicationDate&amp;georss=simplepoint&amp;data"
-            title="RSS Feed (new window)" i18n-title="@@footer.rss" target="_blank" rel="noopener">
+            title="RSS Feed (new window)" i18n-title="@@footer.rss" target="_blank" rel="noopener noreferrer">
             <img class="social-network-link" src="./assets/img/icon_rss.svg" i18n-alt="@@footer.rss" alt="RSS Feed (new window)">
           </a>
         </li>
@@ -67,7 +67,7 @@
     <div class="column metropole">
       <ul>
         <li>
-          <a href="https://www.grandlyon.com/" class="metropolis-website-link" target="_blank" rel="noopener">
+          <a href="https://www.grandlyon.com/" class="metropolis-website-link" target="_blank" rel="noopener noreferrer">
             <img i18n-title="@@footer.metropole.site.title" title="Access the Lyon Metropolis website (new window)"
               class="plus-logo" src="./assets/img/footer-plus.png" alt="">
             <span i18n="@@footer.metropole.site">A Lyon Metropolis website</span>