Update test_dev_ext.yml

[shahidee44]

Description

• The qiskit tests were not completing as qiskit-aer is not automatically installed. The original workflow file used pip install . to install the packages locally. Changed to make local-install to be consistent with newer installation methods as of version 0.2.0.

Checklist

• I have performed a self-review of my code.
• I have commented my code and used numpy-style docstrings
• I have made corresponding updates to the documentation.
• My changes generate no new warnings
• I have added/updated tests to make sure bugfix/feature works.
• New and existing unit tests pass locally with my changes.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Name the new unit-tests that you have added along with this change.