Log Message:
Update ruby-mini-magick to 4.5.1.

v4.5.1

* Fixed MiniMagick logging commands by default

v4.5.0

New features

* Added the ability for ImageMagick commands to accept standard input:

	identify = MiniMagick::Tool::Identify.new
	identify.stdin # adds "-"
	identify.call(stdin: image_content)

* Added ability to capture stdout, stderr and exist status by passing a block
  to MiniMagick::Tool#call:

	compare = MiniMagick::Tool::Compare.new
	# build the command
	compare.call do |stdout, stderr, status|
	  # ...
	end

* Added ability to assign MiniMagick.logger to Rails.logger

Bug fixes

* The value of MiniMagick.whiny configuration option is now respected
* The new filename when calling #format is now generated better when calling
  on a layer
* Delete *.cache files generated by .mpc files when deleting MiniMagick::Image

Deprecations

* Whiny option should now be passed as a keyword argument:

	MiniMagick::Tool::Identify.new(false) # deprecated
	MiniMagick::Tool::Identify.new(whiny: false) # good

* Passing the whiny argument to MiniMagick::Tool#call is deprecated, it should
  now always be passed to MiniMagick::Tool.new