roll: third_party/pigweed pw_build_info: Change kGitCommit to InlineBasicString

kGitCommit being an InlineBasicString:
* Gives it a definite size, usable with std::size().
* Allows c_str() to be used directly without requiring a copy.

Test: `bazelisk run //pw_build_info:git_build_info_test` displays
  the correct git hash.
Original-Bug: 447176148
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/325952
Original-Revision: 8ddcffa65b5948fe4e316daca0dc4749d7cbb4a6

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: cfe6a32dafe6b6..8ddcffa65b5948
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8702620330991704881
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6282cce8dc371e7ea44205c925d5049a70a6ac6d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/326352
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/third_party/pigweed b/third_party/pigweed
index cfe6a32..8ddcffa 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit cfe6a32dafe6b60cea9efcfccfc0c606fbf45ede
+Subproject commit 8ddcffa65b5948fe4e316daca0dc4749d7cbb4a6