fix typo in HighLevelWCSWrapper for axis_correlation_matrix

[sfgraves]

This fixes a small typo in the HighLevelWCSWrapper so that the axis_correlation_matrix from the low level object is correctly exposed.

Description

This pull request is to address ...

Fixes #

[Cadair]

🤦‍♂️

[bsipocz]

the tests need to be updated, too.

[pllim]

I pushed a commit directly to the branch. FYI.

[astrofrog]

Looks good, and that is the correct fix for the test

Edit: this might actually affect released versions, so if so it will need a changelog entry. I can try and check later unless someone beats me to it.

[pllim]

mpldev failure is unrelated.

[pllim]

I think it does affect release... I see this in v3.2.x and v3.1.x branches but not those before:

astropy/astropy/wcs/wcsapi/high_level_wcs_wrapper.py

Lines 66 to 71 in b70ce87

	@property
	def axis_correlation_matrix(self):
	"""
	See `~astropy.wcs.wcsapi.BaseLowLevelWCS.axis_correlation_matrix`
	"""
	return self.low_level_wcs.pixel_bounds

[pllim]

Change log added. And just for completeness, this fixes a bug introduced in #7326 that was milestoned to v3.1.

[pllim]

Good catch, @sfgraves . Thank you!

[bsipocz]

Thanks @sfgraves!