Bump windows python version to 3.8.3 for GitHub CI (#977)
Bump windows python version to 3.8.3 for GitHub CI (#977)

GitHub CI upgrades python to 3.8.3 for Windows. For that we have
to bump it as otherwise the build breaks.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>
tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io