Fix queue serialization test on PyPy
Fix queue serialization test on PyPy

It is not affected by Twisted bug #7989 and is more permissive
with pickling (especially with protocol=2).

scrapy/scrapy,elacuesta/scrapy,pablohoffman/scrapy,wujuguang/scrapy,dangra/scrapy,Ryezhang/scrapy,Parlin-Galanodel/scrapy,scrapy/scrapy,elacuesta/scrapy,umrashrf/scrapy,eLRuLL/scrapy,finfish/scrapy,kmike/scrapy,ssteo/scrapy,pawelmhm/scrapy,ssteo/scrapy,ArturGaspar/scrapy,finfish/scrapy,umrashrf/scrapy,dangra/scrapy,pablohoffman/scrapy,wujuguang/scrapy,Parlin-Galanodel/scrapy,wujuguang/scrapy,starrify/scrapy,starrify/scrapy,pawelmhm/scrapy,ArturGaspar/scrapy,Ryezhang/scrapy,eLRuLL/scrapy,umrashrf/scrapy,ssteo/scrapy,finfish/scrapy,kmike/scrapy,Parlin-Galanodel/scrapy,Ryezhang/scrapy,pablohoffman/scrapy,elacuesta/scrapy,eLRuLL/scrapy,dangra/scrapy,ArturGaspar/scrapy,starrify/scrapy,scrapy/scrapy,pawelmhm/scrapy,kmike/scrapy