Update hub to 2.2.3 (#831)
Update hub to 2.2.3 (#831)

SHA-256 taken from 7zip;
confirmed Windows package tar.gz change to zip following 2.2.2
-> removed "extract_dir" for both architectures;
hub manifest tested on external bucket:
    tom81@DESKTOP-PPA3Q0S ~$ hub version
    git version 2.8.2.windows.1
    hub version 2.2.3

package content differences from 2.2.0 & 2.2.1:
- extract directory folder removed
- hub manual "hub.html" added
- "etc" and "man" build folders removed
- hub.exe moved to package "bin" folder
vinaynambiar/lukesampson-,bpollack/scoop,moigagoo/scoop,rmyorston/scoop,toxeus/scoop,rodericktech/scoop,yunspace/scoop,lukesampson/scoop,nikolasd/scoop,saildata/scoop,berwyn/scoop,kodybrown/scoop,rasa/scoop,reelsense/scoop,Cyianor/scoop,coonce/scoop,systemexitzero/scoop,nueko/scoop,r15ch13/scoop,vidarkongsli/scoop,Congee/scoop