Ignore ImageMagick deprecation of "convert" command.

Ignoring the deprecation warning (present since IM 7.1.1-33, May 2024)
is the quickest fix.

The proper fix would be to switch to using "magick" everywhere but the
command's syntax is a bit different and the CLI usage thus needs to be
verified; moreover this would break users with very old installs of
imagemagick (unless adding some version sniffing code) although IMv7 has
been out since 2016 so that is likely acceptable.  (That proper fix
likely also needs some fiddling around the special-casing of
`rcParams["animation.convert_path"] = "convert"` in
ImageMagickBase.bin_path; e.g. should the rcParams be renamed to
`"animation.magick_path"` and have "magick" be the special case...)

Author: anntzer

lib/matplotlib/__init__.py

@@ -474,7 +474,8 @@ def impl(args, regex, min_ver=None, ignore_exit_code=False):
                     "Failed to find an ImageMagick installation")
         else:
             path = "convert"
-        info = impl([path, "--version"], r"^Version: ImageMagick (\S*)")
+        # Ignore deprecation warning for "convert" on IM>=7.1.1-33.
+        info = impl([path, "--version"], r"(?sm:.*^)Version: ImageMagick (\S*)")
         if info.raw_version == "7.0.10-34":
             # https://github.com/ImageMagick/ImageMagick/issues/2720
             raise ExecutableNotFoundError(