deactivate logging for COPT solver from pulp

[pchtsp]

@wujianjack as you were the one who developed the connector

Details for the issue

https://github.com/coin-or/pulp/actions/runs/8378206781/job/22942209619

What did you do?

Tested COPT in PuLP's CI with msg=False

What did you expect to see?

no information coming from the solver

What did you see instead?

Cardinal Optimizer v7.1.1. Build date Mar  4 2024
Copyright Cardinal Operations 2024. All Rights Reserved

2024-03-21 16:13:33 [INFO] checks license for COPT v7.1.1 20240304
2024-03-21 16:13:33 [WARN] no license files in current working folder: D:\a\pulp\pulp
2024-03-21 16:13:33 [WARN] no license files in binary folder: C:\hostedtoolcache\windows\Python\3.10.11\x64
2024-03-21 16:13:33 [WARN] no license files in HOME folder: C:\Users\runneradmin\copt
2024-03-21 16:13:33 [INFO] empty environment variable: COPT_LICENSE_DIR
2024-03-21 16:13:33 [WARN] no license files in EV 'COPT_LICENSE_DIR': 

No license found. Starting COPT with size limitations for non-commercial use
Please apply for a license from www.shanshu.ai/copt

Useful extra information

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What operating system are you using?

• Windows: ( version: ___ )
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I'm using python version:

• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• Other: ___

I installed PuLP via:

• pypi (python -m pip install pulp)
• github (python -m pip install -U git+https://github.com/coin-or/pulp)
• Other: ___ (conda?)

Did you also

• Tried out the latest github version: https://github.com/coin-or/pulp
• Searched for an existing similar issue: https://github.com/coin-or/pulp/issues?utf8=%E2%9C%93&q=is%3Aissue%20