Fix out of date README comment about version support for dbt-core and duckdb #770

Job	Run time
code-quality	1m 32s
build packages	13s
Check if MotherDuck v0.10.x token exists	1s
Buena Vista functional test / python 3.11	2m 26s
fsspec test / python 3.9	1m 0s
file-based functional test / python 3.9	3m 28s
file-based functional test / python 3.10	3m 25s
functional test / python 3.9	2m 45s
plugins test / python 3.9	1m 3s
file-based functional test / python 3.11	2m 58s
functional test / python 3.10	2m 43s
unit test / python 3.9	1m 7s
file-based functional test / python 3.12	3m 20s
functional test / python 3.11	2m 21s
unit test / python 3.10	1m 0s
functional test / python 3.12	2m 37s
unit test / python 3.11	59s
unit test / python 3.12	1m 11s
MotherDuck functional test / python 3.9	4m 1s
verify packages / python 3.9 / ubuntu-latest	30s
verify packages / python 3.10 / ubuntu-latest	29s
verify packages / python 3.11 / ubuntu-latest	31s
verify packages / python 3.12 / ubuntu-latest	37s
verify packages / python 3.9 / macos-latest	46s
verify packages / python 3.10 / macos-latest	44s
verify packages / python 3.11 / macos-latest	25s
verify packages / python 3.12 / macos-latest	30s
verify packages / python 3.9 / windows-latest	2m 4s
verify packages / python 3.10 / windows-latest	2m 9s
verify packages / python 3.11 / windows-latest	2m 23s
verify packages / python 3.12 / windows-latest	2m 15s
	51m 33s

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