[roll third_party/pigweed] Add TotalSizeBytes to PrefixedEntryRingBuffer

- Added TotalSizeBytes to PrefixedEntryRingBuffer.
- This is needed by users that don't know the size of ring buffer.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/107172

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ce7bb911c8dcde1..7fdd09cc7a5b594
Roller-URL: https://ci.chromium.org/b/8804470730062824561
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I2af55377b00701b4a14156aaa312af25f01dc83f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/108580
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/third_party/pigweed b/third_party/pigweed
index ce7bb91..7fdd09c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ce7bb911c8dcde10833fb1dad7b322d85639617c
+Subproject commit 7fdd09cc7a5b5945da111ca33fc1add8b35bc721