sage

74119807 - gh-38135: Use `magick` command instead of the deprecated `convert` if available

gh-38135: Use `magick` command instead of the deprecated `convert` if available The `convert` command is deprecated and throws a warning at runtime. URL: https://github.com/sagemath/sage/pull/38135 Reported by: Antonio Rojas Reviewer(s): Dima Pasechnik