build(deps): bump third_party/ibex from `f30e84b` to `84232a5`

Bumps [third_party/ibex](https://github.com/lowRISC/ibex) from `f30e84b` to `84232a5`.
- [Commits](https://github.com/lowRISC/ibex/compare/f30e84ba00b1c5e630dea0ba6fbf117ec69ebcc8...84232a5bfa8b020cd05718b2ae21d8584c942df8)

---
updated-dependencies:
- dependency-name: third_party/ibex
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

third_party/ibex

diff --git a/third_party/ibex b/third_party/ibex
index f30e84b..84232a5 160000
--- a/third_party/ibex
+++ b/third_party/ibex
@@ -1 +1 @@
-Subproject commit f30e84ba00b1c5e630dea0ba6fbf117ec69ebcc8
+Subproject commit 84232a5bfa8b020cd05718b2ae21d8584c942df8