Bump scala-library from 2.13.6 to 2.13.9 in /modules/scala_2.13 (#136)

Bumps [scala-library](https://github.com/scala/scala) from 2.13.6 to 2.13.9.
- [Release notes](https://github.com/scala/scala/releases)
- [Commits](scala/scala@v2.13.6...v2.13.9)

---
updated-dependencies:
- dependency-name: org.scala-lang:scala-library
  dependency-type: direct:production
...

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modules/scala_2.13/pom.xml

@@ -14,7 +14,7 @@
     </parent>
 
     <properties>
-        <scala.version>2.13.6</scala.version>
+        <scala.version>2.13.9</scala.version>
         <scala.binary.version>2.13</scala.binary.version>
     </properties>