Update module prometheus/common to v0.16.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/prometheus/common	require	minor	v0.15.0 -> v0.16.0

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Release Notes

prometheus/common

v0.16.0

Compare Source

• Make Duration implement encoding.TextUnmarshaler #​270
• Support authorization credentials (replaces bearer_token) #​272

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