Dev tests should test against qiskit main, not stable branch

[garrison]

This changes the development version tests to test against qiskit main (the development version) rather than stable/1.0 (which is currently the stable version, but will not always be). This was part of #408, which got closed out in favor of #479.

[coveralls]

Pull Request Test Coverage Report for Build 8178975721

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.541%

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Totals
Change from base Build 8178082604:	0.0%
Covered Lines:	2346
Relevant Lines:	2508

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💛 - Coveralls