Fixes checking constraint throws deprecation messages. #5309
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The issue
Fix #5273.
This is a bug from commit 640612d. Because
check_invalid_constraint_type
frompip
throwsPipDeprecationWarning
.The fix
Create our own method for checking if package is constraint or not.
The checklist
news/
directory to describe this fix with the extension.bugfix.rst
,.feature.rst
,.behavior.rst
,.doc.rst
..vendor.rst
. or.trivial.rst
(this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.