Upgrade dependencies

* HttpClient 4.5.13
* HttpCore 4.4.14
* Jetty Reactive Httpclient 1.1.4
* Jackson Databind 2.12.0
* AWS SDK 1.11.916
* Google API Services v1-rev20201112-1.31.0
* Google Oauth 0.22.1
* BouncyCastle 1.67
* AssertJ 3.18.1
* JUnit 5.7.0
* Kotlin 1.4.21
* Kotlin Coroutines 1.4.2
* Mockito 3.6.28
* Spring Framework 5.3.2
* Spring Data 2020.0.2
* Spring Security 5.4.2
* Reactor Dysprosium 2020.0.2

Closes gh-607

src/main/asciidoc/reference/vault-repositories.adoc

@@ -62,7 +62,7 @@ Then add the following to `pom.xml` dependencies section.
   <dependencies>
     <dependency>
       <groupId>org.springframework.data</groupId>
-      <artifactId>spring-data-releasetrain</artifactId>
+      <artifactId>spring-data-bom</artifactId>
       <version>{springDataVersion}</version>
       <scope>import</scope>
       <type>pom</type>

src/main/resources/changelog.txt

@@ -14,6 +14,7 @@ Changes in version 2.3.0-RC1
 * Netty4ClientHttpRequestFactory left uninitialized causing IllegalArgumentException: SSLContext is null #597
 * Logger is not passed required parameter #599
 * Infinite loop when using rotating generic secrets without TTL #601
+* Upgrade dependencies #607
 
 Changes in version 2.3.0-M1
 -----------------------------------------