Fix SootMethod serialization #31

Job	Run time
Test on ubuntu-22.04 with Python 3.8	11s
Test on macos-12 with Python 3.8	10s
Test on windows-2022 with Python 3.8	12s
ci / Build	5m 36s
Test on ubuntu-22.04 with Python 3.9	7s
Test on macos-12 with Python 3.9	8s
Test on windows-2022 with Python 3.9	11s
Test on ubuntu-22.04 with Python 3.1	4s
Test on macos-12 with Python 3.1	9s
Test on windows-2022 with Python 3.1	11s
Test on ubuntu-22.04 with Python 3.11	4s
Test on macos-12 with Python 3.11	9s
Test on windows-2022 with Python 3.11	11s
Test on ubuntu-22.04 with Python 3.12	7s
Test on macos-12 with Python 3.12	9s
Test on windows-2022 with Python 3.12	13s
ci / Lint	57s
ci / Test (0)	16m 30s
ci / Test (1)	16m 30s
ci / Test (2)	16m 28s
ci / Test (3)	16m 26s
ci / Test (4)	16m 14s
ci / Test (5)	16m 9s
ci / Test (6)	16m 8s
ci / Test (7)	15m 25s
ci / Test (8)	14m 36s
ci / Test (9)	13m 28s
ci / Publish Unit Tests Results	1s
	2h 46m 44s

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