[minor][doc] Fix Iceberg config in README #49

Job	Run time
build packages	20s
unit test / python 3.8	55s
unit test / python 3.9	1m 4s
unit test / python 3.10	1m 13s
unit test / python 3.11	1m 23s
verify packages / python 3.8 / ubuntu-latest	46s
verify packages / python 3.9 / ubuntu-latest	50s
verify packages / python 3.10 / ubuntu-latest	35s
verify packages / python 3.11 / ubuntu-latest	48s
verify packages / python 3.8 / macos-latest	54s
verify packages / python 3.9 / macos-latest	1m 9s
verify packages / python 3.10 / macos-latest	1m 13s
verify packages / python 3.11 / macos-latest	1m 2s
verify packages / python 3.8 / windows-latest	2m 35s
verify packages / python 3.9 / windows-latest	2m 4s
verify packages / python 3.10 / windows-latest	2m 2s
verify packages / python 3.11 / windows-latest	2m 14s
	21m 7s

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