Bump spring-boot.version from 2.1.13.RELEASE to 2.2.7.RELEASE (#3236)

Bump spring-boot.version from 2.1.13.RELEASE to 2.2.7.RELEASE

Updates `spring-boot-starter-test` from 2.1.13.RELEASE to 2.2.7.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.1.13.RELEASE...v2.2.7.RELEASE)
Signed-off-by: Ndependabot-preview[bot] <support@dependabot.com>
Co-authored-by: Ndependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: NMarcello Teodori <151025+mteodori@users.noreply.github.com>
Co-authored-by: NMarcello Teodori <marcello.teodori@alfresco.com>

pom.xml

@@ -197,14 +197,11 @@
 
     <!-- versions -->
     <asm.version>7.0</asm.version>
-    <awaitility.version>4.0.2</awaitility.version>
-    <assertj.version>3.13.2</assertj.version>
     <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
     <dependency-check-maven.version>5.3.0</dependency-check-maven.version>
     <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
     <extra-enforcer-rules.version>1.2</extra-enforcer-rules.version>
     <jacoco-maven-plugin.version>0.8.5</jacoco-maven-plugin.version>
-    <junit-jupiter.version>5.5.2</junit-jupiter.version>
     <license-maven-plugin.version>3.0</license-maven-plugin.version>
     <maven-checkstyle-plugin.version>3.1.1</maven-checkstyle-plugin.version>
     <maven-clean-plugin.version>3.1.0</maven-clean-plugin.version>
@@ -215,20 +212,21 @@
     <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
     <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
     <maven-jar-plugin.version>3.1.2</maven-jar-plugin.version>
-    <maven-javadoc-plugin.version>3.0.1</maven-javadoc-plugin.version>
+    <maven-javadoc-plugin.version>3.1.1</maven-javadoc-plugin.version>
     <maven-jxr-plugin.version>3.0.0</maven-jxr-plugin.version>
     <maven-pmd-plugin.version>3.13.0</maven-pmd-plugin.version>
     <maven-project-info-reports-plugin.version>3.0.0</maven-project-info-reports-plugin.version>
     <maven-release-plugin.version>2.5.3</maven-release-plugin.version>
     <maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
-    <maven-site-plugin.version>3.7.1</maven-site-plugin.version>
-    <maven-source-plugin.version>3.0.1</maven-source-plugin.version>
+    <maven-site-plugin.version>3.8.2</maven-site-plugin.version>
+    <maven-source-plugin.version>3.1.0</maven-source-plugin.version>
     <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
-    <spring-boot.version>2.1.13.RELEASE</spring-boot.version>
+    <spring-boot.version>2.2.7.RELEASE</spring-boot.version>
     <versions-maven-plugin.version>2.7</versions-maven-plugin.version>
 
     <!-- configuration properties for tests -->
-    <generated-assertions-folder>${project.build.directory}/generated-test-sources/assertions
+    <generated-assertions-folder>
+      ${project.build.directory}/generated-test-sources/assertions
     </generated-assertions-folder>
     <generated-assertions-package>org.activiti.test</generated-assertions-package>
   </properties>
@@ -241,18 +239,6 @@
         <type>xml</type>
         <classifier>suppression</classifier>
       </dependency>
-      <dependency>
-        <groupId>org.junit</groupId>
-        <artifactId>junit-bom</artifactId>
-        <version>${junit-jupiter.version}</version>
-        <type>pom</type>
-        <scope>import</scope>
-      </dependency>
-      <dependency>
-        <groupId>org.assertj</groupId>
-        <artifactId>assertj-core</artifactId>
-        <version>${assertj.version}</version>
-      </dependency>
       <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
@@ -271,11 +257,6 @@
         <type>pom</type>
         <scope>import</scope>
       </dependency>
-      <dependency>
-        <groupId>org.awaitility</groupId>
-        <artifactId>awaitility</artifactId>
-        <version>${awaitility.version}</version>
-      </dependency>
     </dependencies>
   </dependencyManagement>
   <build>