Disable legacy MD5 buildpack paths

After having a major release (v38) of cf-deployment with the legacy MD5
buildpack paths enabled, we can now switch them off as the
buildpackapplifecycle supports both - legacy MD5 and xxhash64 -
buildpack paths.

Author: philippthun

cf-deployment.yml

@@ -947,7 +947,7 @@ instance_groups:
             encryption_key_0: "((cc_db_encryption_key))"
         staging_upload_user: staging_user
         staging_upload_password: "((cc_staging_upload_password))"
-        legacy_md5_buildpack_paths_enabled: true
+        legacy_md5_buildpack_paths_enabled: false
         temporary_use_logcache: true
         logcache:
           host: log-cache.service.cf.internal