ci: Fix windows runner (bump from Python37 to Python39)
ci: Fix windows runner (bump from Python37 to Python39)

google/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,google/or-tools,or-tools/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,google/or-tools,google/or-tools,or-tools/or-tools