Bump releasePluginVersion from 3.1.0 to 3.1.1

Bumps `releasePluginVersion` from 3.1.0 to 3.1.1.

Updates `org.apache.maven.release:maven-release-api` from 3.1.0 to 3.1.1
- [Release notes](https://github.com/apache/maven-release/releases)
- [Commits](apache/maven-release@maven-release-3.1.0...maven-release-3.1.1)

Updates `org.apache.maven.release:maven-release-manager` from 3.1.0 to 3.1.1
- [Release notes](https://github.com/apache/maven-release/releases)
- [Commits](apache/maven-release@maven-release-3.1.0...maven-release-3.1.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.release:maven-release-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.release:maven-release-manager
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -68,7 +68,7 @@ under the License.
     <javaVersion>8</javaVersion>
     <mavenVersion>3.6.3</mavenVersion>
     <scmVersion>2.1.0</scmVersion>
-    <releasePluginVersion>3.1.0</releasePluginVersion>
+    <releasePluginVersion>3.1.1</releasePluginVersion>
     <sitePluginVersion>3.12.1</sitePluginVersion>
     <antrunPluginVersion>3.1.0</antrunPluginVersion>
     <projectInfoReportsPluginVersion>3.6.0</projectInfoReportsPluginVersion>