release: v0.8.1 — fix release.yml publish + drop broken matrix entries #16

Job	Run time
fmt	13s
miri	1m 13s
clippy	26s
freebsd	2m 36s
cross (loongarch64-unknown-none)	27s
cross (x86_64-unknown-uefi)	33s
asm-verification	1m 52s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	26s
test (macos-latest, aarch64-apple-darwin)	33s
cross (aarch64-unknown-uefi)	33s
deny	2m 9s
cross (riscv64gc-unknown-none-elf)	29s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	27s
qemu-smoke	1m 42s
size-gate	6s
sbom	25s
	14m 10s

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