Support git dependencies in requirements.txt

[rarkins]

Discussed in #26573

^{Originally posted by CynanX January 10, 2024}

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If you have a requirements file as below, the custom repo. dependency is not checked by renovate:

boto3==1.34.15
jsonschema==4.20.0
sample-project @ git+https://gitlab.com/location/sample.git#1.1.0

The above will pull the tagged 1.1.0 from the repo. mentioned.

See here for some write up of the formats supported https://pip.pypa.io/en/stable/reference/requirement-specifiers/#requirement-specifiers