fix: string formatting in delete_user

[songololo]

The delete user method is not working.

This seems to be due to a leftover from javascript style string formatting (dollar sign).

Proposed edits.

These seem to work in the case of my local development environment.

[sourcery-ai]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	0.78 ⭐	0.78 ⭐	0.00
Method Length	40.44 ⭐	40.44 ⭐	0.00
Working memory	6.58 🙂	6.58 🙂	0.00
Quality	83.24% ⭐	83.24% ⭐	0.00%

Other metrics	Before	After	Change
Lines	1232	1232	0

Changed files	Quality Before	Quality After	Quality Change
gotrue/_async/api.py	83.17% ⭐	83.17% ⭐	0.00%
gotrue/_sync/api.py	83.31% ⭐	83.31% ⭐	0.00%

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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[leynier]

@songololo thank you very much for your contribution