Bump log4j-core from 2.13.0 to 2.14.1

Bumps log4j-core from 2.13.0 to 2.14.1.

---
updated-dependencies:
- 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>

picocli-annotation-processing-tests/build.gradle

@@ -14,7 +14,7 @@ dependencies {
     testImplementation "junit:junit:$junitVersion",
                        "com.google.testing.compile:compile-testing:$compileTestingVersion",
                        "org.apache.logging.log4j:log4j-api:2.13.0",
-                       "org.apache.logging.log4j:log4j-core:2.13.0"
+                       "org.apache.logging.log4j:log4j-core:2.14.1"
 
     if (org.gradle.api.JavaVersion.current().isJava8Compatible() && !org.gradle.api.JavaVersion.current().isJava9Compatible()) {
         // only use tools.jar on Java 8, it was removed in Java 9 // https://github.com/google/compile-testing/issues/134

picocli-examples/build.gradle

@@ -31,7 +31,7 @@ dependencies {
                    "org.apache.ivy:ivy:$ivyVersion", // for Intelli/J
                    // for the Logging example
                    "org.apache.logging.log4j:log4j-api:2.13.0",
-                   "org.apache.logging.log4j:log4j-core:2.13.0",
+                   "org.apache.logging.log4j:log4j-core:2.14.1",
                    // for the JSR-380 BeanValidation example
                    "javax.validation:validation-api:2.0.0.Final",
                    "org.hibernate.validator:hibernate-validator:6.1.2.Final",