Bump log4j-core from 2.14.0 to 2.15.0

Bumps log4j-core from 2.14.0 to 2.15.0.

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:production
...

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pom.xml

@@ -36,7 +36,7 @@
         <alpn-boot-version>8.1.7.v20160121</alpn-boot-version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <jacoco.version>0.8.5</jacoco.version>
-        <log4j.version>2.14.0</log4j.version>
+        <log4j.version>2.15.0</log4j.version>
         <org.hyperledger.fabric.sdktest.ITSuite>IntegrationSuite.java</org.hyperledger.fabric.sdktest.ITSuite>
         <gpg.executable>gpg</gpg.executable>
     </properties>