Why cannot pip upgrade from my private gitlab? - ssl

Question

I cannot upgrade my package from private gitlab.
I share a project on a gitlab hosted in my company local network.
Until now, I used to simply upgrade my package with
> pip install -U myPackage
But now, pip tells me my package is up-to-date:
> pip install -U myPackage
Requirement already satisfied: myPackage in <some_windows_path> (1.16.5)
I tried to figure it out and found that pip does not search on the gitlab whereas pip show indicates the right home-page.
So I tried to force pip to take into account the gitlab with some options (--extra-index-url, --find-links).
I also tried to reinstall it from void with (git+https).
In both case I get SSL error.
Since I have no issue with git, I retrieve the certificate used by Git (git config -l) and tried to specified the certificate to pip (--cert).
But it was one more fail.
> uname -a
Windows_NT <some_machine_name> 6 3 x86
> python -V
Python 3.10.4
> pip -V
pip 22.2.2 from <some_windows_path> (python 3.10)
> git -v
git version 2.37.3.windows.1
The issue is linked to SSL certification.
Since I have no issue with Git, I guess we can exclude proxy as a cause.
I must miss something here but what?
> pip install --dry-run --client-cert <windows_path_of_git_config_http.sslcainfo> -U git+https:<gitlab_url>
Collecting git+https:<gitlab_url>
Cloning https:<gitlab_url> to c:\users\me\appdata\local\temp\pip-req-build-m6p4_4ve
Running command git clone --filter=blob:none --quiet https:<gitlab_url> 'C:\Users\me\AppData\Local\Temp\pip-req-build-m6p4_4ve'
fatal: unable to access 'https:<gitlab_url>': SSL certificate problem: unable to get local issuer certificate
error: subprocess-exited-with-error
× git clone --filter=blob:none --quiet https:<gitlab_url> 'C:\Users\me\AppData\Local\Temp\pip-req-build-m6p4_4ve' did not run successfully.
│ exit code: 128
╰─> See above for output.
note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error
× git clone --filter=blob:none --quiet https:<gitlab_url> 'C:\Users\me\AppData\Local\Temp\pip-req-build-m6p4_4ve' did not run successfully.
│ exit code: 128
╰─> See above for output.
note: This error originates from a subprocess, and is likely not a problem with pip.