Correct nets_date converter

[sondrelg]

Accidentally switched from to_date_or_none to to_date in the v2 release. This switches it back.

Closes #90

[sourcery-ai]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	1.96 ⭐	1.96 ⭐	0.00
Method Length	64.00 🙂	63.99 🙂	-0.01 👍
Working memory	6.51 🙂	6.50 🙂	-0.01 👍
Quality	77.31% ⭐	77.31% ⭐	0.00%

Other metrics	Before	After	Change
Lines	1398	1397	-1

Changed files	Quality Before	Quality After	Quality Change
netsgiro/objects.py	76.97% ⭐	76.97% ⭐	0.00%
netsgiro/records.py	70.11% 🙂	70.12% 🙂	0.01% 👍
tests/test_object_building.py	55.75% 🙂	55.75% 🙂	0.00%
tests/test_record_parsing.py	87.95% ⭐	87.95% ⭐	0.00%

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
netsgiro/records.py	TransactionAmountItem2.to_ocr	13 🙂	169 😞	20 ⛔	36.37% 😞	Try splitting into smaller methods. Extract out complex expressions
tests/test_object_building.py	test_transmission_with_single_payment_request_transaction	0 ⭐	336 ⛔	13 😞	47.00% 😞	Try splitting into smaller methods. Extract out complex expressions
netsgiro/records.py	AssignmentEnd.to_ocr	8 ⭐	104 🙂	19 ⛔	48.99% 😞	Extract out complex expressions
netsgiro/objects.py	Assignment.from_records	7 ⭐	149 😞	13 😞	50.93% 🙂	Try splitting into smaller methods. Extract out complex expressions
netsgiro/objects.py	Transmission._get_end_record	11 🙂	119 🙂	10 😞	55.89% 🙂	Extract out complex expressions

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