Bump to gradle 8.7 (#5287)

See https://docs.gradle.org/8.7/release-notes.html.

This is a required, but not complete, prerequisite for testing with Java 22. We'll need to bump groovy versions to pick up full testable support.

Author: devinrsmith

gradle/wrapper/gradle-wrapper.jar

@@ -1,7 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=85719317abd2112f021d4f41f09ec370534ba288432065f4b477b6a3b652910d
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-all.zip
+distributionSha256Sum=194717442575a6f96e1c1befa2c30e9a4fc90f701d7aee33eb879b79e7ff05c0
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME