fix(theme): prevent vertical scrollbar on code group tabs (#1793) (#1805)

Co-authored-by: Divyansh Singh <40380293+brc-dd@users.noreply.github.com>

src/client/theme-default/styles/components/vp-code-group.css

@@ -9,7 +9,8 @@
   margin-left: -24px;
   padding: 0 12px;
   background-color: var(--vp-code-tab-bg);
-  overflow: auto;
+  overflow-x: auto;
+  overflow-y: hidden;
 }
 
 .vp-code-group .tabs::after {