Bump slf4j-api from 1.7.29 to 1.7.30 in /core (#2188)

Bumps [slf4j-api](https://github.com/qos-ch/slf4j) from 1.7.29 to 1.7.30.
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_1.7.29...v_1.7.30)

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

Co-authored-by: null <27856297+dependabot-preview[bot]@users.noreply.github.com>

core/build.gradle

@@ -57,7 +57,7 @@ project.tasks.check.dependsOn(jarFileTest)
 
 dependencies {
     compile 'junit:junit:4.12'
-    compile 'org.slf4j:slf4j-api:1.7.29'
+    compile 'org.slf4j:slf4j-api:1.7.30'
     compile 'org.jetbrains:annotations:17.0.0'
     compile 'javax.annotation:javax.annotation-api:1.3.2'
     compile 'org.apache.commons:commons-compress:1.19'