Downloading of Datasets hosted by graphmining.ai fails due to a expired certificate

[maschill]

As Mentioned in the title, the Download, i.e. the construction of the Dataloader
loader = METRLADatasetLoader() fails with the following error:
...
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1007)
...
During handling of the above exception, another exception occurred:
...
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1007)>

The reason for this is an expired certificate on the servers end. You can still manually download and use the dataset from the server.

[aurorarossi]

Hello! This seems a duplicate of the issue #236