Bump org.apache.httpcomponents.client5:httpclient5 from 5.5.2 to 5.6 (#7025)

Bumps [org.apache.httpcomponents.client5:httpclient5](https://github.com/apache/httpcomponents-client) from 5.5.2 to 5.6.
- [Changelog](https://github.com/apache/httpcomponents-client/blob/master/RELEASE_NOTES.txt)
- [Commits](apache/httpcomponents-client@rel/v5.5.2...rel/v5.6)

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents.client5:httpclient5
  dependency-version: '5.6'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -29,7 +29,7 @@ hibernate = "5.6.15.Final"
 hsqldb = "2.7.4"
 httpcomponents-async = "4.1.5"
 httpcomponents-client = "4.5.14"
-httpcomponents-client5 = "5.5.2"
+httpcomponents-client5 = "5.6"
 # metrics are better with https://github.com/Netflix/Hystrix/pull/1568 introduced
 # in hystrix 1.5.12, but Netflix re-released 1.5.11 as 1.5.18 late in 2018.
 # <=1.5.11 or 1.5.18 doesn't break with Micrometer, but open metrics won't be correct necessarily.