fix(aerospike extension): turn off build in Travis due to image version
fix(aerospike extension): turn off build in Travis due to image version

PHP 8.0 is not supported by Aerospike. See the issue's references.

Closes #2881

LaraDock/laradock,jinnawat/laradock,hnquang112/laradock,jinnawat/laradock,hnquang112/laradock,bestlong/laradock,hnquang112/laradock,bestlong/laradock,hnquang112/laradock,jinnawat/laradock,jinnawat/laradock,bestlong/laradock,bestlong/laradock,bestlong/laradock