roll: third_party/pigweed 4 commits

a7a84b2e1150d89 pw_toolchain: Select Bazel C++ version with config
b38308ca572d185 pw_web: Add icon for info
82dffd7cf457809 docs: Prefer "change" to Google-specific "CL"
479546d9686f3c0 pw_web: Fix keyboard shortcut in repl.rst

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 16db19b7fd651f5..a7a84b2e1150d89
Roller-URL: https://ci.chromium.org/b/8741407944852622225
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4bcc04e81c60271dc13d028146de1ff90cdec315
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/226039
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 16db19b..a7a84b2 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 16db19b7fd651f59b113c418c8825ab9311dd72f
+Subproject commit a7a84b2e1150d89d278af13c7750f8284bc05be3