Firefox 148 ships CSS shape() (#29036)

* updated support for css shape() in firefox

* Update css/types/basic-shape.json

---------

Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>

Author: dletorey

css/types/basic-shape.json

@@ -488,21 +488,9 @@
               },
               "chrome_android": "mirror",
               "edge": "mirror",
-              "firefox": [
-                {
-                  "version_added": "preview"
-                },
-                {
-                  "version_added": "126",
-                  "flags": [
-                    {
-                      "type": "preference",
-                      "name": "layout.css.basic-shape-shape.enabled",
-                      "value_to_set": "true"
-                    }
-                  ]
-                }
-              ],
+              "firefox": {
+                "version_added": "148"
+              },
               "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",