[roll pigweed] pw_protobuf: Rename FieldNumberSizeBytes()

Renames FieldNumberSizeBytes() to TagSizeBytes() to follow naming
conventions of upstream protobuf.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/82200

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 10d8429fd55730e..c93a85b705d0591
Roller-URL: https://ci.chromium.org/b/8805009665965327377
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I72f3ac8d84140b682a1a71be279b429352b3f977
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107970
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pigweed b/pigweed
index 10d8429..c93a85b 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 10d8429fd55730eb82590b3478a3d2bc4e7d3126
+Subproject commit c93a85b705d0591fef4d0740c948ce43043519b3