OpenConcept 1.1.1

Fixed duct with integrated heat exchanger (ImplicitCompressibleDuct).

What's Changed

• Update codecov action version by @eytanadler in #52
• Fix OpenMDAO install in GitHub Actions build by @eytanadler in #53
• Adding OS specification to readthedocs build by @eytanadler in #55
• RTD config update by @kanekosh in #56
• Fix the failed GHA build by @eytanadler in #58
• Fix duct by @eytanadler in #59

Full Changelog: v1.1.0...v1.1.1