Update NDK on CI to r29

This should silence the CMake deprecation warning, and also update to an
NDK with a new enough LLD for the linker-script-based delocate.

Change-Id: Iae8fcbf9468aa62736dd4b498a6224cdb3eae130
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/84087
Commit-Queue: Lily Chen <chlily@google.com>
Reviewed-by: Lily Chen <chlily@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
diff --git a/util/bot/DEPS b/util/bot/DEPS
index 50e1568..6a5d0d5 100644
--- a/util/bot/DEPS
+++ b/util/bot/DEPS
@@ -34,7 +34,7 @@
   # This package does not get updates automatically. To update, bump the version
   # in infra's 3pp/android_ndk/fetch.py (see https://crrev.com/c/6470969), then
   # wait a few hours for the new package to be built.
-  'android_ndk_version': 'version:3@r27d.chromium.1',
+  'android_ndk_version': 'version:3@r29.chromium.1',
   # infra/3pp/tools/bazel_bootstrap/linux-amd64
   # Keep this in sync with .bazelversion.
   'bazel_version': 'version:3@7.6.2.chromium.1',