Edit changelog and include 1.6.13 release notes.

Author: jxblum

spring-geode/src/main/resources/changelog.txt

@@ -4,6 +4,18 @@ https://github.com/spring-projects/spring-boot-data-geode
 =========================================================
 
 
+Changes in version 1.6.13 (2022-10-24)
+--------------------------------------
+Aligns SBDG with Spring Boot 2.6.13.
+
+* Built with Oracle Java 8, JDK 1.8.0_341.
+* Upgrades to Gradle 6.9.3.
+* Upgrades to Spring Boot 2.6.13.
+* Upgrades to Spring Data BOM 2021.1.9 (Q-SR9).
+* Upgrades to Spring Data for Apache Geode 2.6.9.
+* Upgrades to Testcontainers 1.17.5.
+
+
 Changes in version 1.7.4 (2022-09-23)
 -------------------------------------
 Aligns SBDG with Spring Boot 2.7.4