PyWinpty release v2.0.3

Minor PyWinPTY release that temporarily disables ConPTY testing and updates some dependencies.

What's Changed

• PR: Add test that terminate causes EOFError by @blink1073 in #213
• Bump actions/checkout from 2 to 3 by @dependabot in #215
• Update pyo3 requirement from 0.15.0 to 0.16.0 by @dependabot in #214

Full Changelog: v2.0.2...v2.0.3