Fix stack overflow due to recursion in some recursive serializer schemas.

[dmontagu]

@davidhewitt thanks for the help with this

[codspeed-hq]

CodSpeed Performance Report

Merging #1198 will improve performances by 26.51%

_{Comparing fix-segfault-for-some-recursive-schemas (1958399) with main (ea443ba)}

Summary

⚡ 3 improvements
✅ 145 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	fix-segfault-for-some-recursive-schemas	Change
⚡	test_core_future_str	39.4 µs	31.9 µs	+23.58%
⚡	test_core_str	39.1 µs	31.6 µs	+23.76%
⚡	test_core_future	37.7 µs	29.8 µs	+26.51%