Remove unsupported PyPy versions #35

Job	Run time
build_sdist	11s
build_no_ext	15s
Build on macos (aarch64 - auto)	1m 58s
Build on windows (x86_64 - auto)	3m 5s
Build on linux (aarch64 - auto)	2m 18s
Build on windows (aarch64 - auto)	1m 47s
Build on linux (x86_64 - auto)	1m 49s
Build on macos (x86_64 - auto)	2m 22s
Build on linux (s390x - auto)	2m 17s
Build on linux (ppc64le - auto)	2m 19s
Build on linux (x86_64 - musllinux_1_1)	1m 52s
Build on linux (aarch64 - musllinux_1_1)	1m 53s
Release	-1s
	22m 5s

Provide feedback