update config

[MBueschelberger]

In the Config object, we are type-casting several fields to AnyUrl but need the related values as string later on.

For this purpose, we will use the AnyUrl type annotation in order to make sure all Urls have a proper string-pattern with pydantic but type-cast into a string during the model-validation.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
data2rdf
__init__.py	5	0	100%
config.py	26	1	1	96%
utils.py	8	1	1	88%
warnings.py	2	0	100%
data2rdf/models
__init__.py	3	0	100%
base.py	54	5	5	91%
graph.py	100	7	7	93%
mapping.py	39	1	1	97%
utils.py	58	14	14	76%
data2rdf/modes
__init__.py	4	0	100%
data2rdf/parsers
__init__.py	6	0	100%
base.py	135	11	11	92%
csv.py	168	20	20	88%
excel.py	174	17	17	90%
json.py	205	37	37	82%
utils.py	88	10	10	89%
data2rdf/pipelines
__init__.py	2	0	100%
main.py	82	9	9	89%
data2rdf/qudt
__init__.py	0	0	100%
utils.py	42	12	12	71%
TOTAL	1201	145	88%

Tests	Skipped	Failures	Errors	Time
117	0 💤	0 ❌	0 🔥	2m 58s ⏱️