Update dependency ngx-kel-agent to v0.7.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ngx-kel-agent (source)	0.7.14 -> 0.7.15

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Release Notes

k0swe/ngx-kel-agent (ngx-kel-agent)

### [`v0.7.15`](https://redirect.github.com/k0swe/ngx-kel-agent/compare/v0.7.14...v0.7.15) [Compare Source](https://redirect.github.com/k0swe/ngx-kel-agent/compare/v0.7.14...v0.7.15)

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