update version and changelog to reflect 21.7.2 hotfix release (#2615)

Signed-off-by: garyschulte <garyschulte@gmail.com>

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## 21.7.2
+## 21.7.3
 ### Additions and Improvements
 - Migration to Apache Tuweni 2.0 [\#2376](https://github.com/hyperledger/besu/pull/2376)
 - \[EXPERIMENTAL\] Added support for DevP2P-over-TLS [#2536](https://github.com/hyperledger/besu/pull/2536)
@@ -15,6 +15,19 @@
 
 ### Early Access Features
 
+## 21.7.2
+
+### Additions and Improvements
+This release contains improvements and bugfixes for optimum compatibility with other London client versions.
+
+## Bug Fixes
+- hotfix for private transaction identification for mainnet transactions [#2609](https://github.com/hyperledger/besu/pull/2609)
+
+## Download Link
+https://hyperledger.jfrog.io/artifactory/besu-binaries/besu/21.7.2/besu-21.7.2.zip \
+db47fd9ba33b36436ed6798d2474f7621c733353fd04f49d6defffd12e3b6e14
+
+
 ## 21.7.1
 
 ### Additions and Improvements

gradle.properties

@@ -1,4 +1,4 @@
-version=21.7.2-SNAPSHOT
+version=21.7.3-SNAPSHOT
 
 # Workaround for Java 16 and spotless bug 834 https://github.com/diffplug/spotless/issues/834
 org.gradle.jvmargs=--add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED \