android: Update platform-tools from 29.0.5 to 29.0.6

Bug: 1070443
Change-Id: I48c8415cc72e03e87910a47ca07c38330e3dfa17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148284Reviewed-by: Haiyang Pan <hypan@google.com>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758942}

DEPS

@@ -270,7 +270,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling android_sdk_platform-tools_version
   # and whatever else without interference from each other.
-  'android_sdk_platform-tools_version': 'Jxtur3_L9RzY4q79K-AwIahwFW4oi5uYVD5URx9h62wC',
+  'android_sdk_platform-tools_version': 'zMVtBEihXp2Z0NYFNjLLmNrwy6252b_YWG6sh2l0QAcC',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling android_sdk_platforms_version
   # and whatever else without interference from each other.