zerver/lib/cache.py: Fix get_cache_backend's annotation.
zerver/lib/cache.py: Fix get_cache_backend's annotation.

mohsenSy/zulip,vabs22/zulip,hackerkid/zulip,ryanbackman/zulip,showell/zulip,dhcrzf/zulip,amanharitsh123/zulip,aakash-cr7/zulip,TigorC/zulip,PhilSk/zulip,niftynei/zulip,mahim97/zulip,zacps/zulip,rishig/zulip,brockwhittaker/zulip,sonali0901/zulip,christi3k/zulip,j831/zulip,andersk/zulip,blaze225/zulip,dawran6/zulip,susansls/zulip,krtkmj/zulip,JPJPJPOPOP/zulip,mohsenSy/zulip,shubhamdhama/zulip,umkay/zulip,amanharitsh123/zulip,umkay/zulip,ryanbackman/zulip,sup95/zulip,paxapy/zulip,tommyip/zulip,KingxBanana/zulip,punchagan/zulip,aakash-cr7/zulip,verma-varsha/zulip,PhilSk/zulip,JPJPJPOPOP/zulip,isht3/zulip,SmartPeople/zulip,tommyip/zulip,JPJPJPOPOP/zulip,sharmaeklavya2/zulip,paxapy/zulip,ryanbackman/zulip,showell/zulip,susansls/zulip,isht3/zulip,andersk/zulip,rht/zulip,jphilipsen05/zulip,amyliu345/zulip,zacps/zulip,AZtheAsian/zulip,tommyip/zulip,mahim97/zulip,amanharitsh123/zulip,calvinleenyc/zulip,Juanvulcano/zulip,kou/zulip,arpith/zulip,rishig/zulip,shubhamdhama/zulip,dawran6/zulip,grave-w-grave/zulip,vaidap/zulip,Juanvulcano/zulip,joyhchen/zulip,hackerkid/zulip,umkay/zulip,TigorC/zulip,samatdav/zulip,Diptanshu8/zulip,aakash-cr7/zulip,christi3k/zulip,showell/zulip,kou/zulip,cosmicAsymmetry/zulip,zulip/zulip,arpith/zulip,eeshangarg/zulip,kou/zulip,AZtheAsian/zulip,jainayush975/zulip,hackerkid/zulip,Galexrt/zulip,dhcrzf/zulip,sup95/zulip,vabs22/zulip,kou/zulip,reyha/zulip,sharmaeklavya2/zulip,cosmicAsymmetry/zulip,cosmicAsymmetry/zulip,niftynei/zulip,souravbadami/zulip,mohsenSy/zulip,christi3k/zulip,vikas-parashar/zulip,sonali0901/zulip,sonali0901/zulip,Jianchun1/zulip,rht/zulip,krtkmj/zulip,rishig/zulip,brainwane/zulip,dawran6/zulip,sup95/zulip,tommyip/zulip,dattatreya303/zulip,jphilipsen05/zulip,vaidap/zulip,mahim97/zulip,jrowan/zulip,timabbott/zulip,paxapy/zulip,zacps/zulip,brainwane/zulip,vikas-parashar/zulip,jainayush975/zulip,jphilipsen05/zulip,amyliu345/zulip,isht3/zulip,SmartPeople/zulip,arpith/zulip,AZtheAsian/zulip,sharmaeklavya2/zulip,dattatreya303/zulip,sup95/zulip,SmartPeople/zulip,grave-w-grave/zulip,tommyip/zulip,blaze225/zulip,rishig/zulip,Juanvulcano/zulip,dawran6/zulip,samatdav/zulip,jrowan/zulip,Diptanshu8/zulip,ahmadassaf/zulip,sonali0901/zulip,dhcrzf/zulip,joyhchen/zulip,umkay/zulip,calvinleenyc/zulip,andersk/zulip,Diptanshu8/zulip,amyliu345/zulip,jackrzhang/zulip,sonali0901/zulip,PhilSk/zulip,jphilipsen05/zulip,souravbadami/zulip,christi3k/zulip,timabbott/zulip,reyha/zulip,jainayush975/zulip,KingxBanana/zulip,verma-varsha/zulip,JPJPJPOPOP/zulip,sup95/zulip,hackerkid/zulip,TigorC/zulip,Juanvulcano/zulip,Jianchun1/zulip,ahmadassaf/zulip,jrowan/zulip,vabs22/zulip,JPJPJPOPOP/zulip,dattatreya303/zulip,punchagan/zulip,dattatreya303/zulip,cosmicAsymmetry/zulip,peguin40/zulip,zacps/zulip,isht3/zulip,shubhamdhama/zulip,Juanvulcano/zulip,brainwane/zulip,Galexrt/zulip,joyhchen/zulip,synicalsyntax/zulip,zulip/zulip,sharmaeklavya2/zulip,krtkmj/zulip,verma-varsha/zulip,brockwhittaker/zulip,PhilSk/zulip,krtkmj/zulip,sharmaeklavya2/zulip,showell/zulip,KingxBanana/zulip,peguin40/zulip,mahim97/zulip,PhilSk/zulip,peguin40/zulip,mohsenSy/zulip,susansls/zulip,Galexrt/zulip,arpith/zulip,AZtheAsian/zulip,reyha/zulip,souravbadami/zulip,peguin40/zulip,ahmadassaf/zulip,verma-varsha/zulip,brainwane/zulip,calvinleenyc/zulip,jrowan/zulip,samatdav/zulip,grave-w-grave/zulip,jackrzhang/zulip,shubhamdhama/zulip,j831/zulip,isht3/zulip,showell/zulip,ryanbackman/zulip,mohsenSy/zulip,brockwhittaker/zulip,mohsenSy/zulip,KingxBanana/zulip,reyha/zulip,KingxBanana/zulip,showell/zulip,hackerkid/zulip,Diptanshu8/zulip,dhcrzf/zulip,timabbott/zulip,ryanbackman/zulip,krtkmj/zulip,tommyip/zulip,umkay/zulip,ahmadassaf/zulip,zacps/zulip,Jianchun1/zulip,vabs22/zulip,kou/zulip,umkay/zulip,andersk/zulip,vabs22/zulip,sharmaeklavya2/zulip,calvinleenyc/zulip,PhilSk/zulip,cosmicAsymmetry/zulip,calvinleenyc/zulip,samatdav/zulip,jainayush975/zulip,umkay/zulip,calvinleenyc/zulip,AZtheAsian/zulip,synicalsyntax/zulip,grave-w-grave/zulip,ahmadassaf/zulip,punchagan/zulip,zacps/zulip,eeshangarg/zulip,sonali0901/zulip,souravbadami/zulip,dawran6/zulip,andersk/zulip,peguin40/zulip,hackerkid/zulip,jackrzhang/zulip,shubhamdhama/zulip,JPJPJPOPOP/zulip,jainayush975/zulip,rishig/zulip,mahim97/zulip,tommyip/zulip,eeshangarg/zulip,niftynei/zulip,SmartPeople/zulip,vaidap/zulip,isht3/zulip,KingxBanana/zulip,niftynei/zulip,jphilipsen05/zulip,synicalsyntax/zulip,synicalsyntax/zulip,vikas-parashar/zulip,joyhchen/zulip,zulip/zulip,jackrzhang/zulip,brockwhittaker/zulip,blaze225/zulip,aakash-cr7/zulip,synicalsyntax/zulip,AZtheAsian/zulip,zulip/zulip,timabbott/zulip,verma-varsha/zulip,christi3k/zulip,eeshangarg/zulip,timabbott/zulip,j831/zulip,punchagan/zulip,Juanvulcano/zulip,souravbadami/zulip,TigorC/zulip,eeshangarg/zulip,reyha/zulip,Galexrt/zulip,eeshangarg/zulip,punchagan/zulip,krtkmj/zulip,verma-varsha/zulip,vaidap/zulip,jrowan/zulip,grave-w-grave/zulip,grave-w-grave/zulip,vikas-parashar/zulip,brockwhittaker/zulip,rht/zulip,amyliu345/zulip,andersk/zulip,Diptanshu8/zu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