update apply migration test

Since this is using all the migrations, it also means that some of the
values were optimized, so let's reflect that in the changes.

Author: RobinMalfait

packages/@tailwindcss-upgrade/src/codemods/css/migrate-at-apply.test.ts

@@ -113,7 +113,7 @@ it('should apply all candidate migration when migrating with a config', async ()
     `),
   ).toMatchInlineSnapshot(`
     ".foo {
-      @apply tw:flex! tw:[color:var(--my-color)] tw:bg-linear-to-t;
+      @apply tw:flex! tw:text-(--my-color) tw:bg-linear-to-t;
     }"
   `)
 })