chore(deps): bump log4j.version from 2.19.0 to 2.20.0 (#74)

Bumps `log4j.version` from 2.19.0 to 2.20.0.

Updates `log4j-api` from 2.19.0 to 2.20.0
- [Release notes](https://github.com/apache/logging-log4j2/releases)
- [Changelog](https://github.com/apache/logging-log4j2/blob/release-2.x/CHANGELOG.adoc)
- [Commits](https://github.com/apache/logging-log4j2/compare/rel/2.19.0...rel/2.20.0)

Updates `log4j-core` from 2.19.0 to 2.20.0
- [Release notes](https://github.com/apache/logging-log4j2/releases)
- [Changelog](https://github.com/apache/logging-log4j2/blob/release-2.x/CHANGELOG.adoc)
- [Commits](https://github.com/apache/logging-log4j2/compare/rel/2.19.0...rel/2.20.0)

Updates `log4j-slf4j-impl` from 2.19.0 to 2.20.0
- [Release notes](https://github.com/apache/logging-log4j2/releases)
- [Changelog](https://github.com/apache/logging-log4j2/blob/release-2.x/CHANGELOG.adoc)
- [Commits](https://github.com/apache/logging-log4j2/compare/rel/2.19.0...rel/2.20.0)

---
updated-dependencies:
- 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
- dependency-name: org.apache.logging.log4j:log4j-slf4j-impl
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

demo/pom.xml

@@ -17,7 +17,7 @@
         <maven.javadoc.skip>true</maven.javadoc.skip>
         <maven.deploy.skip>true</maven.deploy.skip>
 
-        <log4j.version>2.19.0</log4j.version>
+        <log4j.version>2.20.0</log4j.version>
     </properties>
 
     <artifactId>easysql-demo</artifactId>