Update benchmarks, single global contrasts Dict

[dmbates]

• Revise benchmark code for modern Julia
• Change the global contrasts to a single Dict{Symbol,Any} instead of a Dict of Dicts.

Did behavior change? Did you add need features? If so, please update NEWS.md

• add entry in NEWS.md
• after opening this PR, add a reference and run docs/NEWS-update.jl to update the cross-references.

Should we release your changes right away? If so, bump the version:

• I've bumped the version appropriately

No need to release these changes right away.

[codecov]

Codecov Report

Base: 96.27% // Head: 96.27% // No change to project coverage 👍

Coverage data is based on head (7270567) compared to base (cdf13e9).
Patch has no changes to coverable lines.

❗ Current head 7270567 differs from pull request most recent head fbd7805. Consider uploading reports for the commit fbd7805 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #667   +/-   ##
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  Coverage   96.27%   96.27%           
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  Files          29       29           
  Lines        2739     2739           
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  Hits         2637     2637           
  Misses        102      102           

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