Remove redundant stax2-api pin (#2205)

Author: vy

log4j-core-java9/pom.xml

@@ -30,7 +30,6 @@
   <properties>
     <maven.compiler.release>9</maven.compiler.release>
     <maven.deploy.skip>true</maven.deploy.skip>
-    <stax2-api.version>4.2.2</stax2-api.version>
   </properties>
   <dependencies>
     <!-- Naturally, all implementations require the log4j-api JAR -->
@@ -46,14 +45,6 @@
       <groupId>com.fasterxml.jackson.dataformat</groupId>
       <artifactId>jackson-dataformat-xml</artifactId>
     </dependency>
-    <!-- Pinning `org.codehaus.woodstox:stax2-api` (which is injected by `com.fasterxml.jackson.dataformat:jackson-dataformat-xml`) to avoid `RequireUpperBoundDeps` failures: -->
-    <dependency>
-      <groupId>org.codehaus.woodstox</groupId>
-      <artifactId>stax2-api</artifactId>
-      <version>${stax2-api.version}</version>
-      <scope>runtime</scope>
-      <optional>true</optional>
-    </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-core</artifactId>