Update dependency prometheus_client to v0.7.1

[renovate]

This PR contains the following updates:

Package	Update	Change
prometheus_client	patch	==0.7.0 -> ==0.7.1

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Release Notes

prometheus/client_python

v0.7.1

Compare Source

[BUGFIX] multiprocess: don't crash on missing gauge_live/sum files (#​424)
[BUGFIX] correctly bind method on Python 2.x (#​403)

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[codecov]

Codecov Report

Merging #1238 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1238   +/-   ##
=======================================
  Coverage   89.45%   89.45%           
=======================================
  Files          39       39           
  Lines        3690     3690           
=======================================
  Hits         3301     3301           
  Misses        389      389

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