Add version 2.20.1 to image package

[AvinoamK]

** image 2.20.1 is a bug fix release.

** Improve image spatial filters for higher-dimensional inputs (bug #45088).

** edge: Allow binary input image for edge (bug #55432)

** mormxcorr2: re-write the code and optimize it to make it compatible
with MATLAB (bug #50151)

[mmuetzel]

We got this twice in the CI:

Run: pkg install   image@2.20.1
  
      ERROR: package installation failed
  

After that, the CI attempts to install the package with the -verbose flag. I assume that is to get more verbose information about why the package failed installing.
But the attempt with the -verbose flag succeeds for some reason.

Any idea why it fails in the first place?

It is running this where it catches the error:

packages/assets/ci/octave_ci.m

Lines 85 to 103 in 7a534e0

	## Try to install and test the default (first) version of the changed
	## packages.
	try
	step_group_start (["Run: pkg install ", pkg_name_version]);
	pkg_install_sha256_check (pkg_info, test_dir);
	step_group_end ("done.");
	catch e
	step_group_end ("ERROR: package installation failed");
	## In case of install error, try to get as much information as possible.
	##
	## Note that the installation is likely to fail for packages with
	## "exotic" dependencies.
	step_group_start (["ERROR: pkg install -verbose ", pkg_name_version]);
	pkg ("install", "-verbose", pkg_info.url);
	step_group_end ("done.");
	exit (1); # Return test failed.
	end

[AvinoamK]

Looks like it failed with sha256 calculation, but I have checked it again, and it looks OK.

[AvinoamK]

What should I do now?

[AvinoamK]

Now it succeeded, so I pushed it