chore(deps): update helm release uptime-kuma to v2.8.1

This MR contains the following updates:

Package	Update	Change
uptime-kuma	minor	2.6.10 -> 2.8.1

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Release Notes

dirsigler/uptime-kuma-helm

v2.8.1

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A self-hosted Monitoring tool like "Uptime-Robot".

v2.8.0

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A self-hosted Monitoring tool like "Uptime-Robot".

v2.7.10

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A self-hosted Monitoring tool like "Uptime-Robot".

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