Update coverage action

[MBueschelberger]

Previously the README was not updated with the coverage report when pushed to main.

This branch should fix the issue.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
data2rdf
__init__.py	5	0	100%
config.py	18	0	100%
utils.py	33	6	6	82%
warnings.py	2	0	100%
data2rdf/models
__init__.py	3	0	100%
base.py	47	4	4	91%
graph.py	122	26	26	79%
mapping.py	30	0	100%
data2rdf/modes
__init__.py	4	0	100%
data2rdf/parsers
__init__.py	6	0	100%
base.py	134	11	11	92%
csv.py	165	19	19	88%
excel.py	159	13	13	92%
json.py	143	20	20	86%
utils.py	67	8	8	88%
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	1064	128	88%

Tests	Skipped	Failures	Errors	Time
106	0 💤	0 ❌	0 🔥	2m 41s ⏱️