fix: Use AsyncSession in build_graph_from_db

[cbornet]

Use AsyncSession in build_graph_from_db

[codspeed-hq]

CodSpeed Performance Report

Merging #4649 will degrade performances by 45.11%

_{Comparing cbornet:async-session-build-graph (f1c6497) with main (efe6407)}

Summary

❌ 2 regressions
✅ 13 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	cbornet:async-session-build-graph	Change
❌	test_successful_run_with_input_type_any	163.6 ms	298.1 ms	-45.11%
❌	test_successful_run_with_output_type_debug	197.1 ms	296.1 ms	-33.44%