build(deps): bump httpcore from 4.4.15 to 4.4.16

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
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

exist-parent/pom.xml

@@ -102,7 +102,7 @@
 
         <ant.version>1.10.12</ant.version>
         <apache.httpcomponents.version>4.5.14</apache.httpcomponents.version>
-        <apache.httpcomponents.core.version>4.4.15</apache.httpcomponents.core.version>
+        <apache.httpcomponents.core.version>4.4.16</apache.httpcomponents.core.version>
         <apache.xmlrpc.version>4.0.0</apache.xmlrpc.version>
         <appassembler.version>2.1.0</appassembler.version>
         <aspectj.version>1.9.8.M1</aspectj.version>