build

Bump version to 5.3.1 #492

Job	Run time
linting	19s
test (3.10)	51s
test (pypy-3.9)	1m 45s
test (3.9)	42s
test (3.12)	47s
test (3.11)	48s
test (pypy-3.10)	1m 53s
type-check (pypy-3.9)	18s
type-check (3.9)	20s
type-check (pypy-3.10)	27s
lint_markdown_files	56s
type-check (3.11)	16s
type-check (3.10)	16s
type-check (3.12)	21s
fullstack_production_suite / test	6s
integration_tests / test	7s
	10m 12s

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