Backing up gradle to a version that works with scala 2.10 (#1797)

Gradle 7.2 causes failures building our scala 2.10 artifacts. This commit rolls it back to 7.1, which
seems to work fine.

Author: masseyke

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists