[TEMPLATE] sync with package template

[zacharyburnett]

adds an update.yml workflow from the STScI package template that runs every Monday and checks for new updates to the upstream template at https://github.com/spacetelescope/stsci-package-template. If new commits are found on stsci-package-template@main, this workflow makes a new pull request to THIS repository applying the diff.

Tasks

• Update or add relevant gwcs tests.
• Update relevant docstrings and / or docs/ page.
• Does this PR need a changelog entry? (If not, label with no-changelog-entry-needed.)
  • Write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types).

News fragment change types:

• changes/<PR#>.feature.rst: new feature
• changes/<PR#>.breaking.rst: any change or deprecation of the public API
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.doc.rst: documentation change
• changes/<PR#>.misc.rst: infrastructure or miscellaneous change

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.98%. Comparing base (00a1ad0) to head (6a1c455).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #770   +/-   ##
=======================================
  Coverage   91.98%   91.98%           
=======================================
  Files          40       40           
  Lines        4190     4190           
=======================================
  Hits         3854     3854           
  Misses        336      336           

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