fix: used json.dumps instead of str in sanitize_params

[aduuna]

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

#131 Use json.dumps instead of str in sanitize_params

What is the new behavior?

Feel free to include screenshots if it includes visual changes.

Additional context

Add any other context or screenshots.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.20%.

Quality metrics	Before	After	Change
Complexity	0.60 ⭐	0.60 ⭐	0.00
Method Length	20.75 ⭐	22.00 ⭐	1.25 👎
Working memory	3.20 ⭐	3.20 ⭐	0.00
Quality	95.25% ⭐	95.05% ⭐	-0.20% 👎

Other metrics	Before	After	Change
Lines	16	18	2

Changed files	Quality Before	Quality After	Quality Change
postgrest/utils.py	95.25% ⭐	95.05% ⭐	-0.20% 👎

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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[rawandahmad698]

looks good.

[anand2312]

Tests are failing, please fix them (you added the import statement above the future statement which causes a syntax error)

[J0]

Think we might need to update the test cases for this one as well - would be great if someone can jump on - otherwise I'll take a look when there's a free cycle

[J0]

Hey,

Going to fix the tests on this one so we can get it in - hope you don't mind!

[silentworks]

This will result in a breaking change at the moment. I've ran the tests and there are too many broken tests to get this into a release.