Bump org.apache.httpcomponents.client5:httpclient5 in /library

Bumps [org.apache.httpcomponents.client5:httpclient5](https://github.com/apache/httpcomponents-client) from 5.6 to 5.6.1.
- [Changelog](https://github.com/apache/httpcomponents-client/blob/rel/v5.6.1/RELEASE_NOTES.txt)
- [Commits](apache/httpcomponents-client@rel/v5.6...rel/v5.6.1)

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents.client5:httpclient5
  dependency-version: 5.6.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

library/pom.xml

@@ -40,7 +40,7 @@
     <properties>
         <!-- Latest versions supported (as of March 2026) -->
         <okhttp.version>5.3.2</okhttp.version>
-        <httpclient.version>5.6</httpclient.version>
+        <httpclient.version>5.6.1</httpclient.version>
         <feign.version>13.9.3</feign.version>
         <spring-web.version>7.0.5</spring-web.version>
         <spring-webflux.version>7.0.5</spring-webflux.version>