Bump version supported by MotherDuck in README #389

Job	Run time
code-quality	1m 16s
file-based functional test / python 3.8	4m 20s
Buena Vista functional test / python 3.9	12m 43s
build packages	12s
file-based functional test / python 3.9	4m 14s
fsspec test / python 3.9	1m 1s
file-based functional test / python 3.10	4m 14s
MotherDuck functional test / python 3.9	3m 2s
functional test / python 3.8	4m 4s
file-based functional test / python 3.11	3m 42s
functional test / python 3.9	4m 8s
plugins test / python 3.9	1m 2s
functional test / python 3.10	3m 52s
functional test / python 3.11	3m 30s
unit test / python 3.8	1m 22s
unit test / python 3.9	1m 3s
unit test / python 3.10	52s
unit test / python 3.11	1m 10s
verify packages / python 3.8 / ubuntu-latest	34s
verify packages / python 3.9 / ubuntu-latest	28s
verify packages / python 3.10 / ubuntu-latest	34s
verify packages / python 3.11 / ubuntu-latest	28s
verify packages / python 3.8 / macos-latest	43s
verify packages / python 3.9 / macos-latest	1m 22s
verify packages / python 3.10 / macos-latest	55s
verify packages / python 3.11 / macos-latest	49s
verify packages / python 3.8 / windows-latest	1m 49s
verify packages / python 3.9 / windows-latest	1m 51s
verify packages / python 3.10 / windows-latest	1m 44s
verify packages / python 3.11 / windows-latest	2m 13s
	1h 9m 17s

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