Bump spark-mllib_2.12 in /jvm-packages/xgboost4j-example

Bumps spark-mllib_2.12 from 3.4.0 to 3.4.1.

---
updated-dependencies:
- dependency-name: org.apache.spark:spark-mllib_2.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

jvm-packages/pom.xml

@@ -35,7 +35,7 @@
         <maven.compiler.target>1.8</maven.compiler.target>
         <flink.version>1.17.1</flink.version>
         <junit.version>4.13.2</junit.version>
-        <spark.version>3.4.0</spark.version>
+        <spark.version>3.4.1</spark.version>
         <spark.version.gpu>3.3.2</spark.version.gpu>
         <scala.version>2.12.18</scala.version>
         <scala.binary.version>2.12</scala.binary.version>