Bump Bazel version to 3.5.1
Bump Bazel version to 3.5.1

This latest release includes cherry picks, a new feature and some
important changes [1].

[1] https://github.com/bazelbuild/bazel/releases/tag/3.5.1

Change-Id: I07c9c954102b6ae9117b4495ef68ee4fb69a5212

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