FIX: fix model date format in the user model docstring

[mrakitin]

Description

This PR fixes the date format appearing in the "Authorship and Verification" section of the generated user model. Before the fix, the dates were displayed as 2024YYY-01m-16d. After the fix, they look like: 2024-01-16.

It's part of the https://github.com/SasView/sasview/wiki/ContributorCampXII camp.

Fixes # (issue/issues)

How Has This Been Tested?

The fix was tested by comparing the output of the generated models before (with v6.0.0-alpha1) and after the fix.

Before:

After:

Review Checklist (please remove items if they don't apply):

• Code has been reviewed
• Functionality has been tested
• Windows installer (GH artifact) has been tested (installed and worked)
• MacOSX installer (GH artifact) has been tested (installed and worked)
• User documentation is available and complete (if required)
• Developers documentation is available and complete (if required)
• The introduced changes comply with SasView license (BSD 3-Clause)

[wpotrzebowski]

Code looks good. The reason why Mac installer is failing is lack to acceess to certifcates when forking. (Somethinig I tried to fix before the contributor camp but failed).

[mrakitin]

Thanks for your review, @wpotrzebowski!
Is the target branch (main) fine? Or should I retarget it to release_6.0.0?

[wpotrzebowski]

Thanks for your review, @wpotrzebowski! Is the target branch (main) fine? Or should I retarget it to release_6.0.0?

Good point! We will need it for both but please rebase to 6.0.0 for now and then we will merge to main (after release I suppose)

[mrakitin]

OK, I rebased my commit on the release_6.0.0 (checked out fresh from the release_6.0.0 branch and cherry-picked the 9ee2283b75265c024f2ce685842224bafeac4845 commit).

[wpotrzebowski]

I am merging this PR even though it fails. However it fails because it is opened as a fork and cannot upload artifacts.

[mrakitin]

Thank you, @wpotrzebowski!