(chore) bump version to v1.31.3 for release #1040

Job	Run time
Docker	25s
Compatibility	21s
ubuntu-latest - python 3.8 - Lint	12s
ubuntu-latest - python 3.8 - Type check	20s
Pydantic V1	19s
ubuntu-latest - python 3.8 - Unit tests	1m 14s
ubuntu-latest - python 3.8 - Doc tests	1m 40s
ubuntu-latest - python 3.8 - Doc tests (B)	1m 39s
ubuntu-latest - python 3.8 - Images	41s
ubuntu-latest - python 3.8 - Jobs	16s
ubuntu-latest - python 3.8 - Experiments	30s
ubuntu-latest - python 3.8 - Datasets	51s
ubuntu-latest - python 3.8 - Sweep example	50s
ubuntu-latest - python 3.8 - Build	20s
ubuntu-latest - python 3.8 - Style	19s
ubuntu-latest - python 3.8 - Docs	27s
Release	31s
	10m 55s

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