Safari 26 supports *-self for absolutely-positioned boxes (#29299)

Add Safari data for positioned_boxes content in *-self alignment

Author: jamesnw

css/properties/align-self.json

@@ -525,7 +525,7 @@
               "opera": "mirror",
               "opera_android": "mirror",
               "safari": {
-                "version_added": false
+                "version_added": "26"
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",

css/properties/justify-self.json

@@ -276,7 +276,7 @@
               "opera": "mirror",
               "opera_android": "mirror",
               "safari": {
-                "version_added": false
+                "version_added": "26"
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",

css/properties/place-self.json

@@ -158,7 +158,7 @@
               "opera": "mirror",
               "opera_android": "mirror",
               "safari": {
-                "version_added": false
+                "version_added": "26"
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",