JAVA-2563: Upgrade Spring Boot version to 2.3.3.RELEASE (#9985)

* JAVA-2563: Upgrade Spring Boot version to 2.3.3.RELEASE

* JAVA-2563: Downgrade spring-cloud-connectors-heroku to Spring Boot 2.2.6.RELEASE

* JAVA-2563: Add joda-time version

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Use MongoClients factory instead of MongoClient directly

* JAVA-2563: Downgrade spring-5-data-reactive to Spring Boot 2.2.6.RELEASE

* JAVA-2563: Switch back to default bootstrap mode for JPA

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Switch from ServerHttpRequest to ServerWebExchange interface

* JAVA-2563: Use OutputCaptureRule instead of OutputCapture

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Add spring-boot-starter-validation dependency

* JAVA-2563: Fix Jackson dependency

* JAVA-2563: Fix ManualEmbeddedMongoDbIntegrationTest

* JAVA-2563: Replace validation-api with spring-boot-starter-validation

* JAVA-2563: Fix usage of deprecated getErrorAttributes method

* JAVA-2563: Downgrade spring-data-cassandra-reactive to Spring Boot 2.2.6.RELEASE

* JAVA-2563: Set spring.datasource.generate-unique-name to false in spring-session-jdbc

spring-cloud/spring-cloud-connectors-heroku/pom.xml

@@ -60,6 +60,7 @@
     </dependencyManagement>
 
     <properties>
+        <spring-boot.version>2.2.6.RELEASE</spring-boot.version>
         <spring-cloud-dependencies.version>Hoxton.SR4</spring-cloud-dependencies.version>
         <postgresql.version>42.2.10</postgresql.version>
         <bytebuddy.version>1.10.10</bytebuddy.version>