cmd/--cache: undeprecate --bottle-tag

This is useful for quickly examining bottles with something like

    brew fetch --bottle-tag=$tag $formula && \
      tar xf "$(brew --cache --bottle-tag=$tag $formula)"

See discussion at Homebrew#15632.

Library/Homebrew/cmd/--cache.rb

@@ -27,8 +27,7 @@ def self.__cache_args
       switch "--force-bottle",
              description: "Show the cache file used when pouring a bottle."
       flag "--bottle-tag=",
-           description: "Show the cache file used when pouring a bottle for the given tag.",
-           hidden:      true
+           description: "Show the cache file used when pouring a bottle for the given tag."
       switch "--HEAD",
              description: "Show the cache file used when building from HEAD."
       switch "--formula", "--formulae",
@@ -97,7 +96,6 @@ def self.print_formula_cache(formula, os:, arch:, args:)
       arch:                       args.arch&.to_sym,
     )
       bottle_tag = if (bottle_tag = args.bottle_tag&.to_sym)
-        odeprecated "brew --cache --bottle-tag", "brew --cache --os --arch"
         Utils::Bottles::Tag.from_symbol(bottle_tag)
       else
         Utils::Bottles::Tag.new(system: os, arch: arch)