Revert "Next development version"

This reverts commit b856e90f8bb334aa8ae100240016e8967fcf01fd.

gradle.properties

@@ -1,5 +1,5 @@
 aspectjVersion=1.9.7
 gaeVersion=1.9.93
-springBootVersion=2.2.15.BUILD-SNAPSHOT
+springBootVersion=2.2.13.RELEASE
 version=5.2.14.RELEASE
 org.gradle.jvmargs=-Xmx3g -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError