Update grid-3.vim

https://www.w3.org/TR/2026/WD-css-grid-3-20260121/

after/syntax/css/grid-3.vim

@@ -1,2 +1,2 @@
-syn keyword cssFontProp contained item-tolerance
+syn keyword cssFontProp contained flow-tolerance item-track item-direction item-cross item-pack item-flow
 syn keyword cssFontAttr contained grid-lanes inline-grid-lanes

test/test.css

@@ -652,7 +652,13 @@
 }
 
 .grid-3 {
-  item-tolerance: auto;
+  flow-tolerance: auto;
+  item-track: auto;
+  item-direction: auto;
+  item-cross: auto;
+  item-wrap: auto;
+  item-pack: auto;
+  item-flow: auto;
   display: grid-lanes;
   display: inline-grid-lanes;
 }