[Security] Bump mini_magick from 4.9.2 to 4.9.4

[dependabot-preview]

Bumps mini_magick from 4.9.2 to 4.9.4.

Release notes

Sourced from mini_magick's releases.

v4.9.4

• Fixed a remote shell execution vulnerability when using MiniMagick::Image.open with URL coming from unsanitized user input (thanks to @​rootxharsh)
• Fixed some Ruby warnings (thanks to @​koic)

v4.9.3

• make MiniMagick::Tool not respond to everything

Commits

• 293f9bb Bump to 4.9.4
• 4cd5081 Don't allow remote shell execution
• 152d33a Fix test failure
• 87e9059 Merge pull request #427 from koic/suppress_deprecation_warnings_in_production...
• b5ce047 Suppress warning: instance variable [@​processor_path](https://github.com/processor_path) not initialized
• a74b73e Suppress warning: instance variable [@​cli_path](https://github.com/cli_path) not initialized
• 6fca405 Suppress warning: instance variable [@​cli](https://github.com/cli) not initialized
• 64560f5 Suppress warning: method redefined; discarding old debug=
• 563cc61 Suppress warning: method redefined; discarding old cli_path
• 2965e55 Suppress warning: method redefined; discarding old cli and cli=
• Additional commits viewable in compare view

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[dependabot-preview]

We've just been alerted that this update fixes a security vulnerability:

Sourced from The Ruby Advisory Database.

Remote command execution via filename
A remote shell execution vulnerability when using MiniMagick::Image.open with URL coming from unsanitized user input.
e.g. MiniMagick::Image.open("| touch.txt")

Patched versions: [">= 4.9.4"]