update: update module prometheus/client_golang to v1.9.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/prometheus/client_golang	require	minor	v1.8.0 -> v1.9.0

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Release Notes

prometheus/client_golang

v1.9.0

Compare Source

• [FEATURE] NewPidFileFn helper to create process collectors for processes whose PID is read from a file. #​804
• [BUGFIX] promhttp: Prevent endless loop in InstrumentHandler... middlewares with invalid metric or label names. #​823

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[codecov]

Codecov Report

Merging #110 (4edc086) into master (aaee43d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #110   +/-   ##
=======================================
  Coverage   38.79%   38.79%           
=======================================
  Files           3        3           
  Lines         415      415           
=======================================
  Hits          161      161           
  Misses        246      246           
  Partials        8        8           

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