octave: depend on qt@5.7
octave: depend on qt@5.7

Closes #4918.

Signed-off-by: ilovezfs <fbd54dbbcf9e596abad4ccdc4dfc17f80ebeaee2@icloud.com>

heuermh/homebrew-science,andrewjpage/homebrew-science,philippbayer/homebrew-science,dpo/homebrew-science,maplesond/homebrew-science,pditommaso/homebrew-science,quantumsteve/homebrew-science