Safari 18.4 supports multiple import maps (#26648)

* Multiple import maps supported in Safari 18.4

* Set experimental to false

Author: yoavweiss

html/elements/script.json

@@ -696,15 +696,15 @@
                   "opera": "mirror",
                   "opera_android": "mirror",
                   "safari": {
-                    "version_added": "preview"
+                    "version_added": "18.4"
                   },
                   "safari_ios": "mirror",
                   "samsunginternet_android": "mirror",
                   "webview_android": "mirror",
                   "webview_ios": "mirror"
                 },
                 "status": {
-                  "experimental": true,
+                  "experimental": false,
                   "standard_track": true,
                   "deprecated": false
                 }