Update basic-shape.json in Safari to 17.2 and "experimental" to `…

…false` in `rect()` (mdn#21727)

* Update basic-shape.json in Safari to `"preview"` for `"rect"`

STP 180 added support for `"rect"`, updated Safari to `"preview"`

Release note:
https://developer.apple.com/documentation/safari-technology-preview-release-notes/stp-release-180

Commit:
WebKit/WebKit@60c71ca

* Update basic-shape.json

`rect()` is in Safari 17.2.1
https://developer.apple.com/documentation/safari-release-notes/safari-17_2-release-notes

I tested live in the WPT test and all of the subtests pass:
https://wpt.fyi/results/css/css-contain/content-visibility/content-visibility-svg-rect.html?label=master&label=experimental&aligned&q=%2Fcss%2Fcss-contain%2Fcontent-visibility%2Fcontent-visibility-svg-rect.html

* Update basic-shape.json

Setting experimental to false for `rect()` since it is supported by Safari 17.2.

css/types/basic-shape.json

@@ -486,14 +486,14 @@
               "opera": "mirror",
               "opera_android": "mirror",
               "safari": {
-                "version_added": false
+                "version_added": "17.2"
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",
               "webview_android": "mirror"
             },
             "status": {
-              "experimental": true,
+              "experimental": false,
               "standard_track": true,
               "deprecated": false
             }