chore(deps): update dependency prometheus.prometheus to v0.21.0

This MR contains the following updates:

Package	Type	Update	Change
prometheus.prometheus	galaxy-collection	minor	0.19.0 -> 0.21.0

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Release Notes

prometheus-community/ansible (prometheus.prometheus)

v0.21.0

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Bugfixes

• fix: remove unused variable (https://github.com/prometheus-community/ansible/pull/437)

v0.20.2

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What's Changed

• fix: prevent local binary cache creation with elevated privileges by @​gardar in #​434
• fix: add check_mode in localhost binary cache task by @​santilococo in #​431
• removed: CentOS Stream and Fedora from being officially supported by @​gardar in #​432

v0.20.1

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Bugfixes

• fix: alertmanager deprecated PIDFile= path warning (https://github.com/prometheus-community/ansible/pull/155)

v0.20.0

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Minor Changes

• minor(ci): detect unused ansible variables (https://github.com/prometheus-community/ansible/pull/422)

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