Exclude toolchains.xml from being read

Issue gh-12568
Issue gh-12596

lib/antora/extensions/inject-collector-config.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const BASE_COMMAND = 'gradlew -PbuildSrc.skipTests=true --scan --stacktrace'
+const BASE_COMMAND = 'gradlew -PbuildSrc.skipTests=true -Porg.gradle.java.installations.auto-detect=false --scan --stacktrace'
 const JVM_ARGS='-Xmx3g -XX:+HeapDumpOnOutOfMemoryError'
 const REPO_URL = 'https://github.com/spring-projects/spring-security'
 const TASK_NAME=':spring-security-docs:generateAntora'