Bump marshmallow from 3.23.1 to 3.26.1 #316

Job	Run time
Test ubuntu-latest Python 3.9	2m 13s
Test ubuntu-latest Python 3.10	2m 12s
Test ubuntu-latest Python 3.11	2m 58s
Test ubuntu-latest Python 3.12	2m 20s
Test macos-latest-xlarge Python 3.11	2m 12s
Test macos-latest-xlarge Python 3.12	2m 14s
Test macos-13 Python 3.9	4m 30s
Test macos-13 Python 3.10	3m 9s
Test macos-13 Python 3.11	4m 4s
Test macos-13 Python 3.12	3m 17s
Test windows-latest Python 3.9	6m 17s
Test windows-latest Python 3.10	5m 46s
Test windows-latest Python 3.11	6m 38s
Test windows-latest Python 3.12	6m 23s
	54m 13s

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