Log Message:
Update ruby-mini-magick to 4.3.3.

v4.3.3

* Fixed a bug where, if you would reference any image info inside Image#format
  {} or Image#combine_options {}, this info would be cached even after these
  methods were executed, leaving the MiniMagick::Image instance with stale
  data.

v4.3.2

* Fixed MiniMagick::Image.new("...").format("<ext>") \ 
not working if the image
  didn't have an extension.

v4.3.1

* Reverted making MiniMagick configuration thread safe, until we figure out
  what caused #328.

v4.3.0

* Fixed early reportings of ImageMagick/GraphicsMagick not being installed by
  removing the automagically generated methods (commit)
* MiniMagick.with_cli is now thread-safe, as well as other configuration
  options

v4.2.10

* Make GraphicsMagick's mogrify support the "-gravity" option.

v4.2.9

* Fixes MiniMagick::Image#size to properly return filesize in bytes
* Added MiniMagick::Image#human_size which holds ImageMagick's human-readable
  size string.

v4.2.8

This version has been yanked as it holds a backwards incompatibility which
breaks CarrierWave.

* MiniMagick.with_cli will now restore the old CLI even when errors occur.
* Fixed race condition which caused the MiniMagick::Tool methods not to be
  defined yet (can happen in multithreaded environments)

Backwards compatibility

* MiniMagick::Image#size now returns a string with the filesize unit included