manifest: update LVGL to v8.4.0

Related to zephyrproject-rtos/lvgl#51

(cherry picked from commit 0a8ef12)

Original-Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
GitOrigin-RevId: 0a8ef12
Change-Id: I2031d95c476d55082361611c1f4381b6c24eeb8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5394361
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: Keith Short <keithshort@chromium.org>
Commit-Queue: Fabio Baltieri <fabiobaltieri@google.com>

west.yml

@@ -274,7 +274,7 @@ manifest:
       revision: 1bf2120cffcedae174ae35d695a28a46caefcb23
       path: modules/lib/loramac-node
     - name: lvgl
-      revision: 2b76c641749725ac90c6ac7959ca7718804cf356
+      revision: 2b498e6f36d6b82ae1da12c8b7742e318624ecf5
       path: modules/lib/gui/lvgl
     - name: mbedtls
       revision: 6ec4abdcda78dfc47315af568f93e5ad4398dea0