Bump assertj-core from 3.14.0 to 3.15.0

Bumps [assertj-core](https://github.com/joel-costigliola/assertj-core) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/joel-costigliola/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.14.0...assertj-core-3.15.0)

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

Author: dependabot-preview[bot]

cli/build.gradle

@@ -18,7 +18,7 @@ dependencies {
     compile project(':db')
     compile group: 'com.beust', name: 'jcommander', version: '1.72'
 
-    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.14.0'
+    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.15.0'
     testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.5.1'
     testRuntime group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.6.0'
     testCompile group: 'org.mockito', name: 'mockito-core', version: '3.2.4'

db/build.gradle

@@ -18,7 +18,7 @@ dependencies {
     compile group: 'com.google.code.gson', name: 'gson', version: '2.8.6'
     compile group: 'commons-io', name: 'commons-io', version: '2.6'
 
-    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.14.0'
+    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.15.0'
     testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.5.1'
     testRuntime group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.6.0'
 }

gocd-file-based-secrets-plugin/build.gradle

@@ -35,7 +35,7 @@ dependencies {
 
     extractedAtTopLevel project(':jar-class-loader')
 
-    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.14.0'
+    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.15.0'
     testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.5.1'
     testRuntime group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.6.0'
     testCompile group: 'org.mockito', name: 'mockito-core', version: '3.2.4'