Use Gradle 7.3.1

gradle/wrapper/gradle-wrapper.properties

@@ -6,7 +6,7 @@
 #
 #  https://github.com/mamoe/mirai/blob/master/LICENSE
 #
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.1-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists