Update prometheus-simpleclient monorepo to v0.16.0

[renovate]

This PR contains the following updates:

Package	Update	Change
io.prometheus:simpleclient	minor	0.15.0 -> 0.16.0
io.prometheus:simpleclient_hotspot	minor	0.15.0 -> 0.16.0
io.prometheus:simpleclient_httpserver	minor	0.15.0 -> 0.16.0

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[codecov]

Codecov Report

Merging #823 (5e2a6b1) into master (66a9946) will not change coverage.
Report is 1 commits behind head on master.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #823   +/-   ##
=======================================
  Coverage   78.77%   78.77%           
=======================================
  Files          48       48           
  Lines        3016     3016           
  Branches      142      142           
=======================================
  Hits         2376     2376           
  Misses        640      640