Downgrade Gradle to 7.1 (from 7.2) This should be the latest available to MC 1.16.5

build.gradle

@@ -9,7 +9,7 @@ buildscript {
 		maven { url 'https://jitpack.io' }
     }
     dependencies {
-        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '3.+', changing: true
+        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '5.1.+', changing: true
 		classpath group: 'org.spongepowered', name: 'mixingradle', version: '0.7-SNAPSHOT'
         classpath 'com.github.jengelman.gradle.plugins:shadow:2.0.2'
     }
@@ -140,9 +140,9 @@ dependencies {
     minecraft 'net.minecraftforge:forge:1.16.5-36.1.0'
 
 
-    compile 'org.tukaani:xz:1.9'
+    implementation 'org.tukaani:xz:1.9'
     shadowMe 'org.tukaani:xz:1.9'
-    compile 'org.apache.commons:commons-compress:1.21'
+    implementation 'org.apache.commons:commons-compress:1.21'
     shadowMe 'org.apache.commons:commons-compress:1.21'
 
     // these were added to hopefully allow for cloning

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-7.1.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists