bazel: update bazel to 0.29.0

[lizan]

Signed-off-by: Lizan Zhou lizan@tetrate.io

Description:
Bring back test result publication as result of bazelbuild/bazel#8934.

Risk Level: Low
Testing: CI
Docs Changes:
Release Notes:

[lizan]

FWIW: CI failure seems related to bazelbuild/bazel#9284

[moderation]

Consider bumping bazel-toolchains in https://github.com/envoyproxy/envoy/blob/master/bazel/repository_locations.bzl#L6-L10 with

    bazel_toolchains = dict(
        sha256 = "b8f105a6b226603d64de0f9f4fc80eee13c7d341184eb3275a2869a88cca407b",
        strip_prefix = "bazel-toolchains-0.29.0",
        urls = ["https://github.com/bazelbuild/bazel-toolchains/releases/download/0.29.0/bazel-toolchains-0.29.0.tar.gz"],
    ),

[lizan]

Closing this as 0.29.0 won't work, will wait until 0.29.1 released