Bump httpcore from 4.4.14 to 4.4.15

Bumps httpcore from 4.4.14 to 4.4.15.

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

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

pom.xml

@@ -146,7 +146,7 @@
             <dependency>
                 <groupId>org.apache.httpcomponents</groupId>
                 <artifactId>httpcore</artifactId>
-                <version>4.4.14</version>
+                <version>4.4.15</version>
             </dependency>
             <dependency>
                 <groupId>org.apache.maven.plugin-tools</groupId>