[third_party/pigweed] Roll 2 commits

69a6925451f7f0e pw_containers: Rename to VariableLengthEntryQueue
bc2dd6423e29079 pw_containers: Rename files to variable_length_ent

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 9c83e14502e595e..69a6925451f7f0e
Roller-URL: https://ci.chromium.org/b/8768669217516423153
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9e06c695b407137dae7c6253931e4571cb411840
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/173497
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 9c83e14..69a6925 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 9c83e14502e595e276cb4748be5a4babef127697
+Subproject commit 69a6925451f7f0ee0e9e444dda7679dac5d1ddb6