Update dependency povilasv/systemd_exporter to v0.6.0

[pccibot]

This PR contains the following updates:

Package	Update	Change
povilasv/systemd_exporter	minor	0.5.0 -> 0.6.0

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Release Notes

povilasv/systemd_exporter (povilasv/systemd_exporter)

### [`v0.6.0`](https://togithub.com/prometheus-community/systemd_exporter/releases/tag/v0.6.0): 0.6.0 / 2023-10-30 [Compare Source](https://togithub.com/povilasv/systemd_exporter/compare/v0.5.0...v0.6.0) - \[CHANGE] Remove broken metrics collection [#​68](https://togithub.com/povilasv/systemd_exporter/issues/68) - \[CHANGE] Remove use of cgroups [#​105](https://togithub.com/povilasv/systemd_exporter/issues/105) - \[FEATURE] Add unit timestamp metrics [#​58](https://togithub.com/povilasv/systemd_exporter/issues/58)

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