README.md: Remove note about PyPI #2367

Job	Run time
create-source-distribution	46s
lint	3m 35s
create-windows-binary-distribution (3.7)	4m 54s
create-windows-binary-distribution (3.8)	4m 57s
create-windows-binary-distribution (3.9)	4m 59s
create-windows-binary-distribution (3.10)	5m 39s
create-windows-binary-distribution (3.11)	5m 38s
create-windows-binary-distribution (3.12)	4m 9s
test-linux-source-distribution (ubuntu:20.04)	20m 23s
test-linux-source-distribution (ubuntu:22.04)	20m 14s
test-linux-source-distribution (ubuntu:23.10)	20m 10s
test-linux-source-distribution (ubuntu:24.04)	20m 40s
test-linux-source-distribution (fedora:39)	20m 44s
test-linux-source-distribution (fedora:40)	20m 11s
test-windows-binary-distribution (3.7)	30m 16s
test-windows-binary-distribution (3.8)	30m 50s
test-windows-binary-distribution (3.9)	30m 24s
test-windows-binary-distribution (3.10)	30m 22s
test-windows-binary-distribution (3.11)	31m 59s
test-windows-binary-distribution (3.12)	31m 21s
deploy	30s
	5h 42m 41s

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