formula_versions: use Utils.popen_read instead of backticks
formula_versions: use Utils.popen_read instead of backticks

Closes Homebrew/homebrew#37446.

Signed-off-by: Xu Cheng <9a05244150b861e40c78843b801eed71bca54eac@me.com>

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