[roll third_party/pigweed] pw_protobuf: Extend message to support Float and Double

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/72420

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 16303c3fb6daca5..693db4b737d787f
Roller-URL: https://ci.chromium.org/b/8828560766079313697
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8828560766079313697
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I30ee897a496afd098e540f5cf5d447595bbaf0b2
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/72440
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 16303c3..693db4b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 16303c3fb6daca58b5c4447f102c10ef8a401e63
+Subproject commit 693db4b737d787f8bc9f5be90781dcb18b21de53