roll: pigweed pw_async2: Fix coroutine CMake compilation

Before this, when cxx_std_20 is not present, target
pw_async2.examples.basic exists and depends on non-existing target
pw_async2.coro.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/238132
Original-Revision: 953f4f9ff65006fe565cb4de05ca9780e31ae805

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: e81cd5e642a0c9..953f4f9ff65006
Roller-URL: https://ci.chromium.org/b/8735690782363460385
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id6ed99e7084d891f67c6abd57a875149bcba32e0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/238332
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/MODULE.bazel b/MODULE.bazel
index 442954d..26c7766 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -49,8 +49,8 @@
     module_name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-09-26.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735691559461143889.
-    commit = "e81cd5e642a0c92264caafb14a2f4931cb14fced",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735690782363460385.
+    commit = "953f4f9ff65006fe565cb4de05ca9780e31ae805",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )
 
@@ -58,8 +58,8 @@
     module_name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-09-26.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735691559461143889.
-    commit = "e81cd5e642a0c92264caafb14a2f4931cb14fced",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735690782363460385.
+    commit = "953f4f9ff65006fe565cb4de05ca9780e31ae805",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
     strip_prefix = "pw_toolchain_bazel",
 )