Bump scalatest_2.12 from 3.2.15 to 3.2.16 in /jvm-packages/xgboost4j (#9160)

Bumps [scalatest_2.12](https://github.com/scalatest/scalatest) from 3.2.15 to 3.2.16.
- [Release notes](https://github.com/scalatest/scalatest/releases)
- [Commits](https://github.com/scalatest/scalatest/compare/release-3.2.15...release-3.2.16)

---
updated-dependencies:
- dependency-name: org.scalatest:scalatest_2.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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jvm-packages/pom.xml

@@ -491,7 +491,7 @@
         <dependency>
             <groupId>org.scalatest</groupId>
             <artifactId>scalatest_${scala.binary.version}</artifactId>
-            <version>3.2.15</version>
+            <version>3.2.16</version>
             <scope>test</scope>
         </dependency>
         <dependency>

jvm-packages/xgboost4j/pom.xml

@@ -34,7 +34,7 @@
         <dependency>
           <groupId>org.scalatest</groupId>
           <artifactId>scalatest_${scala.binary.version}</artifactId>
-          <version>3.2.15</version>
+          <version>3.2.16</version>
           <scope>provided</scope>
         </dependency>
     </dependencies>