Revert "Bump biz.aQute.bnd.builder from 6.4.0 to 7.1.0 (graphql-java#3762)" (graphql-java#3763)

This reverts commit c146bc6.

Author: bbakerman

build.gradle

@@ -8,7 +8,7 @@ plugins {
     id 'antlr'
     id 'signing'
     id "com.github.johnrengelman.shadow" version "8.1.1"
-    id "biz.aQute.bnd.builder" version "7.1.0"
+    id "biz.aQute.bnd.builder" version "6.4.0"
     id "io.github.gradle-nexus.publish-plugin" version "2.0.0"
     id "groovy"
     id "me.champeau.jmh" version "0.7.2"