roll: third_party/pigweed pw_bluetooth_proxy: Refactor sniff offload manager to use DynamicMap

Refactor `ConnectionMap` in `SniffOffloadManager` from `pw::IntrusiveMap`
to `pw::DynamicMap` to improve memory management by letting the map
own the elements instead of requiring external allocation.

NO_IFTTT=Refactoring to DynamicMap uses existing pw_containers
dependency.

Original-Bug: 497602321
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/400812
Original-Revision: e61480de08c80dc5a2ba1e78c3952d9ba1a676c2

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: c760ee91982549..e61480de08c80d
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8682569579725623681
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0f71ebb0534b53d189fb0b2f8ac1c122d34b6102
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/407072
diff --git a/third_party/pigweed b/third_party/pigweed
index c760ee9..e61480d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c760ee9198254983ba1dfe9e36c8bef47ef26ade
+Subproject commit e61480de08c80dc5a2ba1e78c3952d9ba1a676c2