community/phpldapadmin: security upgrade to 1.2.6.6 - CVE-2020-35132
needs backport to 3.17
ref https://github.com/leenooks/phpLDAPadmin/compare/1.2.6.5...1.2.6.6
needs backport to 3.17
ref https://github.com/leenooks/phpLDAPadmin/compare/1.2.6.5...1.2.6.6