roll: third_party/pigweed ee6e345..e6a63b7 (2 commits)

e6a63b7:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/484390 pw_rpc2: Add method metadata and update payload serialization
13fe924:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/479685 pw_presubmit: Clean up deprecated git_repo calls

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: ee6e3456bec3c9..e6a63b7d4ebd25
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8669361934277887281
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I172f3c28a3a916bcabf36fb0f0bccedcd26439da
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/488849
diff --git a/third_party/pigweed b/third_party/pigweed
index ee6e345..e6a63b7 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ee6e3456bec3c9e5b6d9037e7d7117e0fa916d0c
+Subproject commit e6a63b7d4ebd25cd2d890097113d41889bf6c237