[roll pigweed] pw_stream: Add missing `override` annotation

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/100781

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 1230361c77f47de..ba4803a688f8801
Roller-URL: https://ci.chromium.org/b/8809803622989659281
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8809803622989659281
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie55b077be61a73b5460ace1f2b5b334f4b81cc94
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/100812
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pigweed b/pigweed
index 1230361..ba4803a 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 1230361c77f47de7813dc5db22747fbeaa2cd9b8
+Subproject commit ba4803a688f880136e545278d8b3691200b94264