Bump junit-jupiter from 5.6.0 to 5.8.1

Bumps [junit-jupiter](https://github.com/junit-team/junit5) from 5.6.0 to 5.8.1.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](junit-team/junit5@r5.6.0...r5.8.1)

---
updated-dependencies:
- dependency-name: org.junit.jupiter:junit-jupiter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -52,7 +52,7 @@ dependencies {
     implementation("org.apache.poi:poi-ooxml:4.1.2")
     implementation("org.apache.poi:poi-ooxml-schemas:4.1.2")
 
-    testImplementation('org.junit.jupiter:junit-jupiter:5.6.0')
+    testImplementation('org.junit.jupiter:junit-jupiter:5.8.1')
     testImplementation("org.hamcrest:hamcrest:2.2")
 }