download_strategy: escape spaces in git submodule path.
download_strategy: escape spaces in git submodule path.

for issue Homebrew/homebrew#36646

Closes Homebrew/homebrew#36649.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

gregory-nisbet/brew,tonyg/homebrew,konqui/brew,zmwangx/brew,gregory-nisbet/brew,mistydemeo/homebrew,reitermarkus/brew,palxex/brew,zmwangx/brew,AnastasiaSulyagina/brew,muellermartin/dist,jmsundar/brew,gordonmcshane/homebrew,jmsundar/brew,AnastasiaSulyagina/brew,sjackman/homebrew,amar-laksh/brew_sudo,ilovezfs/brew,rwhogg/brew,jmsundar/brew,reitermarkus/brew,toonetown/homebrew,sjackman/homebrew,tonyg/homebrew,hanxue/linuxbrew,bfontaine/brew,mahori/brew,reelsense/brew,bfontaine/brew,vitorgalvao/brew,gordonmcshane/homebrew,mistydemeo/homebrew,Homebrew/brew,sjackman/homebrew,EricFromCanada/brew,JCount/brew,mahori/brew,maxim-belkin/brew,alyssais/brew,vitorgalvao/brew,reitermarkus/brew,muellermartin/dist,vitorgalvao/brew,mistydemeo/homebrew,reelsense/brew,amar-laksh/brew_sudo,MikeMcQuaid/brew,claui/brew,palxex/brew,mahori/brew,EricFromCanada/brew,DomT4/brew,rwhogg/brew,muellermartin/dist,alyssais/brew,reelsense/brew,bfontaine/brew,gordonmcshane/homebrew,nandub/brew,konqui/brew,alyssais/brew,pseudocody/brew,sjackman/homebrew,nandub/brew,Linuxbrew/brew,claui/brew,maxim-belkin/brew,aw1621107/brew,Homebrew/brew,MikeMcQuaid/brew,Linuxbrew/brew,ilovezfs/brew,mgrimes/brew,AnastasiaSulyagina/brew,claui/brew,rwhogg/brew,EricFromCanada/brew,aw1621107/brew,DomT4/brew,claui/brew,JCount/brew,MikeMcQuaid/brew,Linuxbrew/brew,vitorgalvao/brew,staticfloat/brew,Linuxbrew/brew,JCount/brew,konqui/brew,staticfloat/brew,EricFromCanada/brew,tonyg/homebrew,maxim-belkin/brew,staticfloat/brew,DomT4/brew,toonetown/homebrew,pseudocody/brew,nandub/brew,mgrimes/brew,amar-laksh/brew_sudo,toonetown/homebrew,nandub/brew,Homebrew/brew,gregory-nisbet/brew,konqui/brew,hanxue/linuxbrew,zmwangx/brew,JCount/brew,mgrimes/brew,mahori/brew,DomT4/brew,ilovezfs/brew,aw1621107/brew,palxex/brew,hanxue/linuxbrew,pseudocody/brew,reitermarkus/brew,MikeMcQuaid/brew,Homebrew/brew