fix(deps): update module github.com/elastic/go-elasticsearch/v8 to v8.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/elastic/go-elasticsearch/v8	v8.14.0 -> v8.15.0

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Release Notes

elastic/go-elasticsearch (github.com/elastic/go-elasticsearch/v8)

v8.15.0

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