submanifests: optional: Bump nanopb to 0.4.9

Sync upstream and get the latest tagged version 0.4.9.

(cherry picked from commit 0775b50)

Original-Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>
GitOrigin-RevId: 0775b50
Cr-Build-Id: 8731572062094510337
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8731572062094510337
Copybot-Job-Name: zephyr-main-copybot-downstream
Change-Id: I021bd65b85a1abc42c0a566fbdce60c9d233e53b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/6008706
Tested-by: Al Semjonovs <asemjonovs@google.com>
Commit-Queue: Al Semjonovs <asemjonovs@google.com>
Reviewed-by: Al Semjonovs <asemjonovs@google.com>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>

submanifests/optional.yaml

@@ -22,7 +22,7 @@ manifest:
       groups:
         - optional
     - name: nanopb
-      revision: 4474bd35bd39de067f0532a1b19ce3aed9ed9807
+      revision: 98bf4db69897b53434f3d0ba72e0a3ab1a902824
       path: modules/lib/nanopb
       remote: upstream
       groups: