roll: third_party/pigweed 6dac613..b2d61c1 (4 commits)

b2d61c1:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/429314 pw_metric: Add opt-in 64-bit metric support
766c92b:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/438995 pw_bluetooth_sapphire: Check delegate is alive before dereferencing
944e765:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/438996 pw_bluetooth_sapphire: Add missing return to LowEnergyConnectionServer
157ff65:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/439052 pw_preprocessor: Add PW_INTERNAL_ATTRIBUTED_CAPTURED_BY_THIS

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 6dac61326e3147..b2d61c14f9359e
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8675719513700533745
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I69ab9a0141b309760839a796358f8fc434d07303
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/439392
diff --git a/third_party/pigweed b/third_party/pigweed
index 6dac613..b2d61c1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 6dac61326e3147ad995da0978a14b760a557b209
+Subproject commit b2d61c14f9359ecc1731c27d9eff52423cfb2f1a