Bump dokka-gradle-plugin from 1.5.30 to 1.5.31 (#97)

Bumps [dokka-gradle-plugin](https://github.com/Kotlin/dokka) from 1.5.30 to 1.5.31.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.5.30...v1.5.31)

---
updated-dependencies:
- dependency-name: org.jetbrains.dokka:dokka-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -2,7 +2,7 @@ version '1.0-SNAPSHOT'
 
 buildscript {
     ext.kotlin_version = '1.5.31'
-    ext.dokka_version = '1.5.30'
+    ext.dokka_version = '1.5.31'
     ext.bnd_version = '5.3.0'
     ext.license_version = '0.15.0'
     ext.vanniktech_version = '0.18.0'