Update default deprecation horizon
Update default deprecation horizon

Because the master branch is already 6.0.

mechanicles/rails,yhirano55/rails,vipulnsward/rails,eileencodes/rails,tjschuck/rails,gfvcastro/rails,georgeclaghorn/rails,aditya-kapoor/rails,illacceptanything/illacceptanything,MSP-Greg/rails,iainbeeston/rails,Vasfed/rails,untidy-hair/rails,prathamesh-sonpatki/rails,BlakeWilliams/rails,fabianoleittes/rails,repinel/rails,aditya-kapoor/rails,fabianoleittes/rails,fabianoleittes/rails,rails/rails,yalab/rails,Erol/rails,Erol/rails,Edouard-chin/rails,yalab/rails,rails/rails,rafaelfranca/omg-rails,notapatch/rails,eileencodes/rails,repinel/rails,joonyou/rails,prathamesh-sonpatki/rails,baerjam/rails,yawboakye/rails,betesh/rails,mohitnatoo/rails,tjschuck/rails,arunagw/rails,illacceptanything/illacceptanything,betesh/rails,Stellenticket/rails,deraru/rails,iainbeeston/rails,illacceptanything/illacceptanything,yahonda/rails,jeremy/rails,utilum/rails,rails/rails,kmcphillips/rails,iainbeeston/rails,vipulnsward/rails,yhirano55/rails,Edouard-chin/rails,mechanicles/rails,eileencodes/rails,BlakeWilliams/rails,lcreid/rails,esparta/rails,jeremy/rails,BlakeWilliams/rails,printercu/rails,arunagw/rails,illacceptanything/illacceptanything,prathamesh-sonpatki/rails,tgxworld/rails,MSP-Greg/rails,mohitnatoo/rails,yawboakye/rails,illacceptanything/illacceptanything,fabianoleittes/rails,utilum/rails,palkan/rails,mechanicles/rails,yawboakye/rails,printercu/rails,prathamesh-sonpatki/rails,Erol/rails,MSP-Greg/rails,aditya-kapoor/rails,tjschuck/rails,notapatch/rails,Stellenticket/rails,kddeisz/rails,Stellenticket/rails,flanger001/rails,bogdanvlviv/rails,georgeclaghorn/rails,kmcphillips/rails,mechanicles/rails,illacceptanything/illacceptanything,untidy-hair/rails,starknx/rails,travisofthenorth/rails,deraru/rails,notapatch/rails,Envek/rails,tgxworld/rails,palkan/rails,georgeclaghorn/rails,travisofthenorth/rails,Erol/rails,notapatch/rails,printercu/rails,gfvcastro/rails,starknx/rails,bogdanvlviv/rails,shioyama/rails,yhirano55/rails,baerjam/rails,gfvcastro/rails,shioyama/rails,repinel/rails,bogdanvlviv/rails,tgxworld/rails,untidy-hair/rails,yalab/rails,Vasfed/rails,Vasfed/rails,Envek/rails,deraru/rails,assain/rails,lcreid/rails,pvalena/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,mohitnatoo/rails,betesh/rails,arunagw/rails,aditya-kapoor/rails,untidy-hair/rails,esparta/rails,yawboakye/rails,flanger001/rails,pvalena/rails,BlakeWilliams/rails,gfvcastro/rails,joonyou/rails,schuetzm/rails,bogdanvlviv/rails,lcreid/rails,mohitnatoo/rails,gauravtiwari/rails,arunagw/rails,vipulnsward/rails,esparta/rails,yalab/rails,assain/rails,vipulnsward/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,palkan/rails,EmmaB/rails-1,pvalena/rails,Envek/rails,kmcphillips/rails,jeremy/rails,tgxworld/rails,deraru/rails,Vasfed/rails,rafaelfranca/omg-rails,utilum/rails,EmmaB/rails-1,schuetzm/rails,joonyou/rails,palkan/rails,illacceptanything/illacceptanything,schuetzm/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,joonyou/rails,betesh/rails,esparta/rails,baerjam/rails,schuetzm/rails,illacceptanything/illacceptanything,rails/rails,illacceptanything/illacceptanything,gauravtiwari/rails,EmmaB/rails-1,yahonda/rails,utilum/rails,eileencodes/rails,travisofthenorth/rails,starknx/rails,kmcphillips/rails,Stellenticket/rails,jeremy/rails,MSP-Greg/rails,Edouard-chin/rails,Edouard-chin/rails,assain/rails,Envek/rails,pvalena/rails,gauravtiwari/rails,illacceptanything/illacceptanything,kddeisz/rails,travisofthenorth/rails,kddeisz/rails,assain/rails,shioyama/rails,printercu/rails,lcreid/rails,flanger001/rails,baerjam/rails,kddeisz/rails,yhirano55/rails,yahonda/rails,tjschuck/rails,repinel/rails,iainbeeston/rails,yahonda/rails,flanger001/rails,rafaelfranca/omg-rails,shioyama/rails