* Update plugins/download-commands from branch 'master'
  - Align on writing "SHA" in "allowTipSHA1InWant"
    
    Even if git-config key names are case-insensitive, align on writing
    "allowTipSHA1InWant" with upper-cased "SHA" as that is how Git upstream
    [1] and Gerrit code [2] do it.
    
    [1] https://git-scm.com/docs/git-config#git-config-uploadpackallowTipSHA1InWant
    [2] https://gerrit.googlesource.com/plugins/download-commands/+/refs/heads/master/src/main/java/com/googlesource/gerrit/plugins/download/command/GitDownloadCommand.java#42
    
    Change-Id: Ie28ceec4703e22d696a3601a0e61ad52ca121b29