Bump httpcore from 4.4.15 to 4.4.16 (zalando#1431)

Bumps httpcore from 4.4.15 to 4.4.16.

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents:httpcore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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logbook-httpclient/pom.xml

@@ -33,7 +33,7 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpcore</artifactId>
-            <version>4.4.15</version>
+            <version>4.4.16</version>
         </dependency>
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>