Bump pf4j from 3.0.1 to 3.1.0 (#187)

Bumps [pf4j](https://github.com/pf4j/pf4j) from 3.0.1 to 3.1.0.
- [Release notes](https://github.com/pf4j/pf4j/releases)
- [Changelog](https://github.com/pf4j/pf4j/blob/master/CHANGELOG.md)
- [Commits](pf4j/pf4j@release-3.0.1...release-3.1.0)

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

build.gradle

@@ -78,7 +78,7 @@ configure(subprojects.findAll { !it.name.startsWith("examples/") }) {
         dependencies {
             dependency 'org.projectlombok:lombok:1.18.10'
 
-            dependency 'org.pf4j:pf4j:3.0.1'
+            dependency 'org.pf4j:pf4j:3.1.0'
 
             dependencySet(group: 'io.rsocket', version: '0.11.16') {
                 entry 'rsocket-transport-netty'