Bump log4j.version from 2.20.0 to 2.21.1 (#694)

Bumps `log4j.version` from 2.20.0 to 2.21.1.

Updates `org.apache.logging.log4j:log4j-slf4j2-impl` from 2.20.0 to 2.21.1

Updates `org.apache.logging.log4j:log4j-api` from 2.20.0 to 2.21.1

Updates `org.apache.logging.log4j:log4j-core` from 2.20.0 to 2.21.1

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-slf4j2-impl
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.logging.log4j:log4j-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

planetiler-core/pom.xml

@@ -17,7 +17,7 @@
 
   <properties>
     <geotools.version>30.0</geotools.version>
-    <log4j.version>2.20.0</log4j.version>
+    <log4j.version>2.21.1</log4j.version>
     <prometheus.version>0.16.0</prometheus.version>
     <protobuf.version>3.24.4</protobuf.version>
     <geopackage.version>6.6.3</geopackage.version>