fix: update prism-react-renderer theme imports for new package structure

Author: Ahkshaey Ravi

.github/workflows/validate.yaml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: "18"
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: |
             node_modules

demo/src/utils/prismDark.mjs

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import darkTheme from "prism-react-renderer/themes/vsDark/index.cjs.js";
+import darkTheme from "prism-react-renderer/themes/vsDark";
 
 export default {
   plain: {

demo/src/utils/prismLight.mjs

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import lightTheme from "prism-react-renderer/themes/github/index.cjs.js";
+import lightTheme from "prism-react-renderer/themes/github";
 
 export default {
   ...lightTheme,