Bump Boost to 1.66.0

[bgoodri]

Summary:

BH is based on Boost 1.66.0 so we should match sometime before the next release

Description:

BH is based on Boost 1.66.0 so we should match sometime before the next release. Also, if we want to use the Boost Compute library from 1.66.0, we can.

Reproducible Steps:

There is no issue.

Current Output:

There is no output.

Expected Output:

I do not expect any output.

Additional Information:

There is no additional information.

Current Version:

v2.17.0

[bob-carpenter]

I'll take caref of this. It's testing on my machine now, so if it works, I should be able to push this afternoon.