Bump pyo3-build-config from 0.20.0 to 0.20.3 #4301

Job	Run time
Check for upstream trigger phrase	3s
Test importing with bare requirements	12m 5s
Build & Test (ubuntu-latest, python: 3.9, distributed: false)	8m 43s
Build & Test (ubuntu-latest, python: 3.10, distributed: false)	8m 41s
Build & Test (ubuntu-latest, python: 3.11, distributed: false)	8m 52s
Build & Test (ubuntu-latest, python: 3.12, distributed: false)	9m 20s
Build & Test (windows-latest, python: 3.9, distributed: false)	16m 58s
Build & Test (windows-latest, python: 3.10, distributed: false)	17m 16s
Build & Test (windows-latest, python: 3.11, distributed: false)	18m 36s
Build & Test (windows-latest, python: 3.12, distributed: false)	15m 7s
Build & Test (macos-latest, python: 3.9, distributed: false)	12m 58s
Build & Test (macos-latest, python: 3.10, distributed: false)	12m 20s
Build & Test (macos-latest, python: 3.11, distributed: false)	13m 49s
Build & Test (macos-latest, python: 3.12, distributed: false)	11m 28s
Build & Test (ubuntu-latest, python: 3.9, distributed: true)	8m 35s
Build & Test (ubuntu-latest, python: 3.11, distributed: true)	9m 16s
	3h 4m 7s

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