roll: third_party/pigweed 535fb4d..a20565c (3 commits)

a20565c:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/406652 workflows.json: Add "sandbox" program
751ecf1:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/401992 pw_ide: Stop filtering headers in .clangd file
9aae51b:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/406274 pw_kernel: Add interrupt tests to rp2350 target

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 535fb4dba4b0b6..a20565cb512ae4
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8682611264793263233
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I50a840ba2720000ec3169c4578de3736f94be3e4
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/406739
diff --git a/third_party/pigweed b/third_party/pigweed
index 535fb4d..a20565c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 535fb4dba4b0b66deabae13cd9ccf5c705dc2b32
+Subproject commit a20565cb512ae4eebdea1b96928c274d4b9deab5