online audit: use GET instead of HEAD
online audit: use GET instead of HEAD

I also removed the `-L` flag which is already present in
`HOMEBREW_CURL_ARGS`.

Closes Homebrew/homebrew#42352.

Signed-off-by: Baptiste Fontaine <bfee279af59f3e3f71f7ce1fa037ea7b90f93cbf@yahoo.fr>

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