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fa2e546b - Add workaround for debugpy install issue to contrib docs. (#1835)

Add workaround for debugpy install issue to contrib docs. (#1835) When following the Quick Start instructions in the contributing docs, I was getting a "WheelFileValidationError" on installation of debugpy which was blocking the installation of a number of other deps. Google turned up this [GitHub issue](https://github.com/microsoft/debugpy/issues/1246) indicating a regression in Poetry 1.4.1 and workarounds. This PR updates the contrib docs noting the issue and the workarounds.