Bump scala-library from 2.13.8 to 2.13.9 in /bom

Bumps [scala-library](https://github.com/scala/scala) from 2.13.8 to 2.13.9.
- [Release notes](https://github.com/scala/scala/releases)
- [Commits](scala/scala@v2.13.8...v2.13.9)

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

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

bom/pom.xml

@@ -27,7 +27,7 @@
 
     <properties>
         <scala.version>2.13</scala.version> <!-- for scala libraries the scala version is used in their artifactId -->
-        <scala.full.version>2.13.8</scala.full.version>
+        <scala.full.version>2.13.9</scala.full.version>
 
         <javac.source>17</javac.source>
         <javac.target>17</javac.target>