chore(deps): update module github.com/prometheus/client_model to v0.6.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/prometheus/client_model	require	minor	v0.5.0 -> v0.6.0

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Release Notes

prometheus/client_model (github.com/prometheus/client_model)

v0.6.0

Compare Source

What's Changed

• Add unit field to MetricFamily proto message by @​vesari in https://github.com/prometheus/client_model/pull/75
• add exemplar to native histogram by @​fatsheep9146 in https://github.com/prometheus/client_model/pull/80

New Contributors

• @​vesari made their first contribution in https://github.com/prometheus/client_model/pull/75
• @​fatsheep9146 made their first contribution in https://github.com/prometheus/client_model/pull/80

Full Changelog: https://github.com/prometheus/client_model/compare/v0.5.0...v0.6.0

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