Upgrade to Spring Framework 5.1.19.RELEASE.

Author: jxblum

gradle.properties

@@ -4,7 +4,7 @@ byteBuddyVersion=1.10.18
 mockitoVersion=3.6.0
 multithreadedtcVersion=1.01
 pivotalGemFireVersion=9.5.4
-springVersion=5.1.18.RELEASE
+springVersion=5.1.19.RELEASE
 springBootVersion=2.1.18.BUILD-SNAPSHOT
 springDataGemFireVersion=2.1.20.RELEASE
 springDataGeodeVersion=2.1.20.RELEASE