Updates tests for new code and updates snapshot

Author: owenniblock

src/__tests__/TabNav.test.tsx

@@ -13,7 +13,7 @@ describe('TabNav', () => {
   const tabNavMarkup = (
     <Box>
       <TabNav>
-        <TabNav.Link id="first" href="#">
+        <TabNav.Link id="first" href="#" as="div">
           First
         </TabNav.Link>
         <TabNav.Link id="middle" href="#" selected>

src/__tests__/__snapshots__/TabNav.test.tsx.snap

@@ -48,6 +48,7 @@ exports[`TabNav TabNav.Link renders consistently 1`] = `
   aria-selected={false}
   className="c0 TabNav-item"
   role="tab"
+  tabIndex={-1}
 />
 `;