JavaScript Tracker: bump git submodule to 2.8.0 (close #3261)
JavaScript Tracker: bump git submodule to 2.8.0 (close #3261)

Propertyfinder/snowplow,Propertyfinder/snowplow,sspinc/snowplow,aldemirenes/snowplow,aldemirenes/snowplow,acgray/snowplow,snowplow/snowplow,Propertyfinder/snowplow,sspinc/snowplow,liveintent-berlin/snowplow,acgray/snowplow,aldemirenes/snowplow,acgray/snowplow,sspinc/snowplow,liveintent-berlin/snowplow,acgray/snowplow,acgray/snowplow,sspinc/snowplow,aldemirenes/snowplow,RetentionGrid/snowplow,liveintent-berlin/snowplow,liveintent-berlin/snowplow,Propertyfinder/snowplow,snowplow/snowplow,acgray/snowplow,RetentionGrid/snowplow,snowplow/snowplow,liveintent-berlin/snowplow,RetentionGrid/snowplow,liveintent-berlin/snowplow,sspinc/snowplow,Propertyfinder/snowplow,sspinc/snowplow,RetentionGrid/snowplow,snowplow/snowplow,aldemirenes/snowplow,RetentionGrid/snowplow,aldemirenes/snowplow,Propertyfinder/snowplow