test-bot: skip optional deps when computing formulae test order

Closes Homebrew/homebrew#45611.

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

Library/Homebrew/cmd/test-bot.rb

@@ -715,7 +715,7 @@ module Homebrew
       changed_formulae_dependents = {}
 
       @formulae.each do |formula|
-        formula_dependencies = Utils.popen_read("brew", "deps", formula).split("\n")
+        formula_dependencies = Utils.popen_read("brew", "deps", "--skip-optional", formula).split("\n")
         unchanged_dependencies = formula_dependencies - @formulae
         changed_dependences = formula_dependencies - unchanged_dependencies
         changed_dependences.each do |changed_formula|