Bump org.bstats:bstats-bukkit from 3.0.3 to 3.1.0 in /plugin

Bumps [org.bstats:bstats-bukkit](https://github.com/Bastian/bStats-Metrics) from 3.0.3 to 3.1.0.
- [Release notes](https://github.com/Bastian/bStats-Metrics/releases)
- [Commits](Bastian/bstats-metrics@v3.0.3...v3.1.0)

---
updated-dependencies:
- dependency-name: org.bstats:bstats-bukkit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

plugin/build.gradle.kts

@@ -31,7 +31,7 @@ dependencies {
 
     implementation(project(":api"))
 
-    implementation("org.bstats:bstats-bukkit:3.0.3")
+    implementation("org.bstats:bstats-bukkit:3.1.0")
 
     annotationProcessor("org.projectlombok:lombok:1.18.34")
 }