deps: update undici to 8.4.0 #7714

Job	Run time
Build slim tarball	1m 8s
aarch64-linux: Cache V8 build	24s
aarch64-darwin: with shared libraries	29m 1s
x86_64-darwin: with shared libraries	40m 58s
x86_64-linux: with shared libraries	31m 42s
aarch64-linux: with shared openssl-1.1.1w	25m 32s
aarch64-linux: with shared openssl-3.6.2	25m 52s
aarch64-linux: with shared openssl-3.5.6	26m 10s
aarch64-linux: with shared boringssl-0.20260508.0	24m 50s
aarch64-linux: with shared openssl-3.0.20	25m 53s
aarch64-linux: with shared openssl-4.0.0	25m 57s
Build slim tarball	1m 8s
x86_64-darwin: with shared libraries	40m 58s
x86_64-linux: with shared libraries	31m 42s
aarch64-darwin: with shared libraries	29m 1s
aarch64-linux: with shared openssl-3.6.2	22m 30s
aarch64-linux: with shared openssl-3.5.6	26m 10s
aarch64-linux: with shared openssl-1.1.1w	25m 32s
aarch64-linux: with shared boringssl-0.20260508.0	24m 50s
aarch64-linux: with shared openssl-3.0.20	25m 53s
aarch64-linux: with shared openssl-4.0.0	25m 57s
aarch64-linux: Cache V8 build	24s
	8h 31m 32s

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