[major] Drop Python 3.7 support and complete poetry migration

[noxan]

#1269

[github-actions]

Model Benchmark

Benchmark	Metric	main	current	diff
AirPassengers	MAE_val	13.0626	13.0626	0.0%	✅
AirPassengers	RMSE_val	15.9453	15.9453	0.0%	✅
AirPassengers	Loss_val	0.00131	0.00131	0.0%	✅
AirPassengers	MAE	9.88156	9.88156	0.0%	✅
AirPassengers	RMSE	11.7354	11.7354	0.0%	✅
AirPassengers	Loss	0.00052	0.00052	0.0%	✅
AirPassengers	time	5.47177	5.22	-4.6%	✅
YosemiteTemps	MAE_val	1.3442	1.3442	0.0%	✅
YosemiteTemps	RMSE_val	2.00245	2.00245	0.0%	✅
YosemiteTemps	Loss_val	0.00077	0.00077	0.0%	✅
YosemiteTemps	MAE	1.3192	1.3192	0.0%	✅
YosemiteTemps	RMSE	2.13518	2.13518	0.0%	✅
YosemiteTemps	Loss	0.00064	0.00064	0.0%	✅
YosemiteTemps	time	68.9094	67.8	-1.61%	✅
PeytonManning	MAE_val	0.58159	0.58159	0.0%	✅
PeytonManning	RMSE_val	0.72216	0.72216	0.0%	✅
PeytonManning	Loss_val	0.01239	0.01239	0.0%	✅
PeytonManning	MAE	0.41671	0.41671	0.0%	✅
PeytonManning	RMSE	0.55961	0.55961	0.0%	✅
PeytonManning	Loss	0.00612	0.00612	0.0%	✅
PeytonManning	time	13.0514	12.76	-2.23%	✅

Model training plots

Model Training

PeytonManning

YosemiteTemps

AirPassengers

[codecov-commenter]

Codecov Report

Merging #1271 (e3f2aa5) into main (0ea55d3) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main    #1271      +/-   ##
==========================================
- Coverage   89.87%   89.85%   -0.03%     
==========================================
  Files          38       38              
  Lines        5078     5136      +58     
==========================================
+ Hits         4564     4615      +51     
- Misses        514      521       +7     

Impacted Files	Coverage Δ
neuralprophet/forecaster.py	87.38% <100.00%> (ø)

... and 6 files with indirect coverage changes

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[noxan]

Follow up task #1299

[leoniewgnr]

LGTM