Bump Python to 0.3.0-beta.2 #1874

Job	Run time
build-benchmarks	2m 54s
check-features-with-external-dependencies (-F gdal -F gdal/bindgen)	48s
check-features	33s
check-features-with-external-dependencies (-F geos)	35s
Lint and Test	8m 19s
check-features (-F csv)	19s
check-features-with-external-dependencies (-F proj)	43s
check-features (-F flatgeobuf)	23s
check-features (-F flatgeobuf_async)	37s
check-features (-F geozero)	24s
check-features (-F ipc_compression)	43s
check-features (-F parquet)	27s
check-features (-F parquet_async)	36s
check-features (-F parquet_compression)	43s
check-features (-F polylabel)	27s
check-features (-F postgis)	42s
check-features (-F rayon)	25s
	19m 38s

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