Update snapshots for next (#846)

Co-authored-by: GitHub Action <[email protected]>

Author: github-actions[bot]

lib/a11y-snapshot/__snapshots__/material-ui.test.js.snap

@@ -294,14 +294,14 @@ exports[`chromium / 1`] = `
     </list>
     <paragraph>
       <text>Currently</text>
-      <link>v5.0.0-alpha.8. View versions page.</link>
+      <link>v5.0.0-alpha.9. View versions page.</link>
       <text>. Released under the</text>
       <link>MIT License</link>
       <text>.Copyright ©2020Material-UI.</text>
     </paragraph>
   </contentinfo>
   <link>Material-UI</link>
-  <link>v5.0.0-alpha.8</link>
+  <link>v5.0.0-alpha.9</link>
   <separator orientation="horizontal"></separator>
   <text>Diamond Sponsors</text>
   <link>
@@ -18215,7 +18215,7 @@ exports[`firefox / 1`] = `
     </list>
     <paragraph>
       <text>Currently</text>
-      <link>v5.0.0-alpha.8. View versions page.</link>
+      <link>v5.0.0-alpha.9. View versions page.</link>
       <text>. Released under the</text>
       <link>MIT License</link>
       <text>. Copyright © 2020 Material-UI.</text>