Bump scala.version from 2.11.8 to 2.13.1

Bumps `scala.version` from 2.11.8 to 2.13.1.

Updates `scala-library` from 2.11.8 to 2.13.1
- [Release notes](https://github.com/scala/scala/releases)
- [Commits](scala/scala@v2.11.8...v2.13.1)

Updates `scala-reflect` from 2.11.8 to 2.13.1
- [Release notes](https://github.com/scala/scala/releases)
- [Commits](scala/scala@v2.11.8...v2.13.1)

Updates `scala-compiler` from 2.11.8 to 2.13.1
- [Release notes](https://github.com/scala/scala/releases)
- [Commits](scala/scala@v2.11.8...v2.13.1)

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

Author: dependabot[bot]

pom.xml

@@ -57,7 +57,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <scala.version>2.11.8</scala.version>
+        <scala.version>2.13.1</scala.version>
         <scala.binary.version>2.11</scala.binary.version>
         <scala.jline.version>2.11.0-M3</scala.jline.version>
         <jetty.version>9.2.16.v20160414</jetty.version>