Bump log4j-api from 2.14.1 to 2.16.0

Bumps log4j-api from 2.14.1 to 2.16.0.

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

picocli-annotation-processing-tests/build.gradle

@@ -13,7 +13,7 @@ dependencies {
     implementation project(':picocli-codegen')
     testImplementation "junit:junit:$junitVersion",
                        "com.google.testing.compile:compile-testing:$compileTestingVersion",
-                       "org.apache.logging.log4j:log4j-api:2.14.1",
+                       "org.apache.logging.log4j:log4j-api:2.16.0",
                        "org.apache.logging.log4j:log4j-core:2.14.1"
 
     if (org.gradle.api.JavaVersion.current().isJava8Compatible() && !org.gradle.api.JavaVersion.current().isJava9Compatible()) {

picocli-examples/build.gradle

@@ -30,7 +30,7 @@ dependencies {
     implementation "org.codehaus.groovy:groovy-all:$groovyVersion",
                    "org.apache.ivy:ivy:$ivyVersion", // for Intelli/J
                    // for the Logging example
-                   "org.apache.logging.log4j:log4j-api:2.14.1",
+                   "org.apache.logging.log4j:log4j-api:2.16.0",
                    "org.apache.logging.log4j:log4j-core:2.14.1",
                    // for the JSR-380 BeanValidation example
                    "javax.validation:validation-api:2.0.1.Final",