Upgrading to React 19.

package.json

@@ -65,23 +65,23 @@
     "pretty-ms": "^9.2.0",
     "prismjs": "^1.29.0",
     "prop-types": "^15.8.1",
-    "react": "^18.3.1",
+    "react": "^19.0.0",
     "react-ace": "^13.0.0",
     "react-bootstrap": "2.10.8",
     "react-collapse": "^5.1.1",
     "react-copy-to-clipboard": "^5.1.0",
     "react-datetime": "^3.3.1",
     "react-diff-viewer": "^3.1.1",
-    "react-dom": "^18.3.1",
+    "react-dom": "^19.0.0",
     "react-dropzone": "^14.3.5",
     "react-height": "^3.0.2",
     "react-helmet": "^6.1.0",
     "react-immutable-proptypes": "^2.2.0",
-    "react-intl": "6.8.9",
+    "react-intl": "7.1.4",
     "react-motion": "^0.5.2",
     "react-redux": "^9.2.0",
-    "react-router": "^6.28.2",
-    "react-router-dom": "^6.28.2",
+    "react-router": "^7.1.3",
+    "react-router-dom": "^7.1.3",
     "react-syntax-highlighter": "^15.6.1",
     "react-toggle": "4.1.3",
     "redux": "^5.0.1",

src/components/layout/Footer/Footer.js

@@ -10,9 +10,9 @@ const Footer = ({ version }) => (
         defaultMessage="<strong>Version</strong> {version} (<a>changelog</a>)"
         values={{
           version,
-          strong: text => <strong>{text}</strong>,
+          strong: text => <strong key="strong">{text}</strong>,
           a: caption => (
-            <a href="https://github.com/ReCodEx/wiki/wiki/Changelog" target="_blank" rel="noreferrer">
+            <a key="link" href="https://github.com/ReCodEx/wiki/wiki/Changelog" target="_blank" rel="noreferrer">
               {caption}
             </a>
           ),
@@ -24,7 +24,7 @@ const Footer = ({ version }) => (
       defaultMessage="Copyright © 2016-{year} <a>ReCodEx</a> SIS extension. All rights reserved."
       values={{
         a: caption => (
-          <a href="http://github.com/recodex" target="_blank" rel="noreferrer">
+          <a key="link" href="http://github.com/recodex" target="_blank" rel="noreferrer">
             {caption}
           </a>
         ),