deps: Update version.elasticsearch to v7.17.21 (stable/8.2)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
co.elastic.clients:elasticsearch-java	7.17.20 -> 7.17.21
org.elasticsearch.client:elasticsearch-rest-client	7.17.20 -> 7.17.21

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