Node Exporter: update dependencies and add darwin universal support

[onetechnical]

Summary

Node exporter is provided to optionally expose metrics for algod. This PR updates the binary with algorand/node_exporter#9 changes. The binaries were collected from the Github Actions artifacts.

The Darwin binaries were lipoed into a universal binary. The Makefile was updated so that if built from a universal target (which would set CROSS_COMPILE_ARCH) it should use universal target. A regular make should use the arch-specific target.

Test Plan

Verified make pulled an arch-specific target, while make universal pulled the universal target.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.68%. Comparing base (272ec02) to head (b1f5ad5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6280      +/-   ##
==========================================
+ Coverage   51.63%   51.68%   +0.04%     
==========================================
  Files         647      647              
  Lines       86907    86907              
==========================================
+ Hits        44876    44918      +42     
+ Misses      39161    39122      -39     
+ Partials     2870     2867       -3     

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