fix: resolve a11y warnings from Svelte version 3.58 (#1732)

* chore(deps-dev): upgrade svelte to 3.58

* chore(a11y): ignore false positives

Referencing the upstream Carbon React implementation, these warnings can be ignored.

* fix(list-box-menu-item): set `tabindex` to `-1`

* chore: fix `tabindex` capitalization

The Svelte Language server does not detect `tabIndex` as a valid attribute.

Note, however, that `tabIndex` is correct when using it in JavaScript (e.g., `node.tabIndex`).

src/ContentSwitcher/ContentSwitcher.svelte

@@ -58,6 +58,7 @@
 </script>
 
 <!-- svelte-ignore a11y-mouse-events-have-key-events -->
+<!-- svelte-ignore a11y-interactive-supports-focus -->
 <div
   role="tablist"
   class:bx--content-switcher="{true}"