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Bump python from 3.14.5-alpine to 3.15.0rc1-alpine #276

Job	Run time
py3.11-ubuntu-latest-jsonschema	47s
py3.12-windows-latest-jsonschema	1m 43s
py3.13-windows-latest-jsonschema-rs	1m 46s
py3.11-windows-latest-jsonschema	1m 45s
py3.13-ubuntu-latest-jsonschema	54s
py3.12-ubuntu-latest-jsonschema-rs	46s
py3.10-ubuntu-latest-jsonschema	45s
py3.13-windows-latest-jsonschema	1m 27s
py3.12-ubuntu-latest-jsonschema	45s
py3.14-ubuntu-latest-jsonschema	1m 21s
py3.10-windows-latest-jsonschema	1m 31s
py3.14-windows-latest-jsonschema	2m 16s
	15m 46s