Revert "[Gradle] Upgrade to Gradle 8.0.1 and Shadow 8.1.0."

This reverts commit 847bddb.

build.gradle

@@ -16,7 +16,7 @@
 
 plugins {
     id 'java-library'
-    id 'com.github.johnrengelman.shadow' version '8.1.0' apply false
+    id 'com.github.johnrengelman.shadow' version '7.1.2' apply false
     id 'biz.aQute.bnd.builder' version '6.4.0' apply false
     id 'com.github.ben-manes.versions' version '0.46.0'
 }
@@ -1075,6 +1075,6 @@ tasks.named('dependencyUpdates').configure {
 }
 
 wrapper {
-    gradleVersion = '8.0.1'
+    gradleVersion = '7.6'
     distributionType = 'ALL'
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.0.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-all.zip
 networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists