Bump org.functionaljava:functionaljava-java8 from 4.6 to 4.8.1

Bumps [org.functionaljava:functionaljava-java8](https://github.com/functionaljava/functionaljava) from 4.6 to 4.8.1.
- [Changelog](https://github.com/functionaljava/functionaljava/blob/series/5.x/.changelogged.yaml)
- [Commits](functionaljava/functionaljava@v4.6...v4.8.1)

---
updated-dependencies:
- dependency-name: org.functionaljava:functionaljava-java8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vavr-benchmark/pom.xml

@@ -42,7 +42,7 @@
         <dependency>
             <groupId>org.functionaljava</groupId>
             <artifactId>functionaljava-java8</artifactId>
-            <version>4.6</version>
+            <version>4.8.1</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.collections</groupId>