Update dependency puppet/systemd to v6.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
puppet/systemd	minor	6.3.0 -> 6.4.0

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Release Notes

voxpupuli/puppet-systemd (puppet/systemd)

### [`v6.4.0`](https://togithub.com/voxpupuli/puppet-systemd/blob/HEAD/CHANGELOG.md#v640-2024-02-24) [Compare Source](https://togithub.com/voxpupuli/puppet-systemd/compare/v6.3.0...v6.4.0) [Full Changelog](https://togithub.com/voxpupuli/puppet-systemd/compare/v6.3.0...v6.4.0) **Implemented enhancements:** - Support `StartLimitIntervalSec` and `StartLimitBurst` [#​412](https://togithub.com/voxpupuli/puppet-systemd/pull/412) ([traylenator](https://togithub.com/traylenator)) - unit type: add `ConditionPathIsMountPoint` [#​408](https://togithub.com/voxpupuli/puppet-systemd/pull/408) ([fragfutter](https://togithub.com/fragfutter)) - Allow percent (%) character in unit names. [#​401](https://togithub.com/voxpupuli/puppet-systemd/pull/401) ([traylenator](https://togithub.com/traylenator)) **Fixed bugs:** - Support multiple Environment Settings [#​409](https://togithub.com/voxpupuli/puppet-systemd/pull/409) ([traylenator](https://togithub.com/traylenator)) - Deleting duplicate Key entries in types/unit/service.pp [#​407](https://togithub.com/voxpupuli/puppet-systemd/pull/407) ([C24-AK](https://togithub.com/C24-AK)) - systemd::cache = false result was vague. [#​403](https://togithub.com/voxpupuli/puppet-systemd/pull/403) ([traylenator](https://togithub.com/traylenator))

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