editoast: downgrade reqwest to mitigate timeout issues #5840

Job	Run time
check_commits	6s
build	12m 25s
check_railjson_generator	1m 49s
check_generated_railjson_sync	21s
Check final newline	9s
check_infra_schema_sync	21s
check_integration_tests	1m 26s
check_osrd_schema	43s
check_toml	5s
check_core	4m 21s
check_editoast_tests	7m 37s
check_editoast_lints	5m 5s
check_editoast_openapi	3m 26s
check_front	2m 26s
check_front_rtk_sync	2m 11s
check_gateway	2m 18s
integration_tests	4m 49s
	49m 38s

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