Prepare next development iteration.

Set Spring Boot version to 2.7.3-SNAPSHOT.

Set version to 1.7.3-SNAPSHOT.

Author: jxblum

gradle.properties

@@ -8,7 +8,7 @@ multithreadedtcVersion=1.01
 pivotalCloudCacheVersion=1.14.4
 pivotalGemFireVersion=9.10.16
 springVersion=5.3.22
-springBootVersion=2.7.2
+springBootVersion=2.7.3-SNAPSHOT
 springCloudBindingsVersion=1.8.1
 springDataBomVersion=2021.2.2
 springDataGeodeVersion=2.7.2
@@ -17,4 +17,4 @@ springSessionBomVersion=2021.2.0
 springSessionDataGeodeVersion=2.7.0
 springShellVersion=1.2.0.RELEASE
 testcontainersVersion=1.17.3
-version=1.7.2
+version=1.7.3-SNAPSHOT