Bump log4j-core from 2.0-beta8 to 2.17.1

Bumps log4j-core from 2.0-beta8 to 2.17.1.

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index d3b02c8..3ae5f65 100644
--- a/pom.xml
+++ b/pom.xml
@@ -89,7 +89,7 @@
     <junit-benchamrks.version>0.7.0</junit-benchamrks.version>
 
     <slf4j.version>1.7.5</slf4j.version>
-    <log4j2.version>2.0-beta8</log4j2.version>
+    <log4j2.version>2.17.1</log4j2.version>
 
     <oro.bundle.version>2.0.8_5</oro.bundle.version>
     <osgi.version>4.2.0</osgi.version>