Issues running the latest versions of Python-MIP on AWS lambda functions

**Bug**
With the two latest versions of Python-MIP (`1.14.0` and `1.15.0`) I seem to have issues running on AWS lambda functions. When calling the lambda function, the issue that appears is the following:

``` import mip.cbc\n File \"/tmp/sls-py-req/mip/cbc.py\", line 603, in \n Osi_getNumCols = cbclib.Osi_getNumCols\nNameError: name 'cbclib' is not defined\n"```

This issue is also reported in other places, and, as far as I understand it, the proposed solution is to add the CBC binaries manually, as described here: https://python-mip.readthedocs.io/en/latest/install.html

This solved the aforementioned error. However, this seems to be resulting in much longer solving times (sometimes more than doubling). Is this a known or explainable issue? Are there alternatives for resolving the initial problem?

Important to mention is that the reason for wanting to upgrade from `1.13.0` to `1.15.0` is that when calling the solver multiple times in a row, the solver sometimes seems to get stuck in an infinite loop (reproducing the error doesn't seem to be easy, as it seems to be machine/OS-dependent). My guess was that that issue was solved in https://github.com/coin-or/Cbc/commit/e008a3644f0d31f312574f2c9e25fdc463c69255

Lambda function specifications:
- OS: Amazon Linux 2 (see https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html)
- Python version: 3.9
- Thanks in advance! Feel free to ask questions if anything is missing or unclear.