maint: Upgrade luxon to 3.3.0.

The Module federation warning "Unable to find required version" is fixed
since webpack v5.78.0 for modules which do package.json
self-referencing.

Ref:
- webpack/webpack#16683
- webpack/webpack#16685

package.json

@@ -18,7 +18,7 @@
         "imagesloaded": "^4.1.4",
         "jquery": "^3.6.4",
         "jquery-jcrop": "^0.9.13",
-        "luxon": "2.4.0",
+        "luxon": "3.3.0",
         "marked": "^4.3.0",
         "masonry-layout": "^4.2.2",
         "moment": "^2.29.4",