feat: support pandas 2.1 #61

Job	Run time
lint	45s
build on linux (x86_64 - auto)	34s
build on linux (aarch64 - auto)	34s
build on macos (x86_64 - auto)	22s
build on macos (aarch64 - auto)	28s
build on windows (x86_64 - auto)	31s
build on windows (i686 - auto)	32s
build on linux (i686 - auto)	31s
build on linux (armv7 - auto)	32s
build on linux (x86_64 - musllinux_1_1)	30s
build on linux (aarch64 - musllinux_1_1)	33s
build on linux (ppc64le - auto)	33s
build on linux (s390x - auto)	32s
test 3.9 pandas 2.0.*	44s
test 3.9 pandas 2.1.*	44s
test 3.10 pandas 2.0.*	30s
test 3.10 pandas 2.1.*	30s
test 3.11 pandas 2.0.*	39s
test 3.11 pandas 2.1.*	39s
test 3.8 pandas 2.0.*	1s
test 3.12 pandas none	30s
test pypy3.8 pandas none	1s
test pypy3.9 pandas none	1s
test pypy3.10 pandas none	1s
check	2s
release	1s
	11m 20s

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