Update httpclient.version to v5.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.httpcomponents.client5:httpclient5-fluent (source)	5.6 → 5.6.1
org.apache.httpcomponents.client5:httpclient5-cache (source)	5.6 → 5.6.1
org.apache.httpcomponents.client5:httpclient5 (source)	5.6 → 5.6.1

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