quic: fixup quic stream variable chunk len #6570

Job	Run time
Build slim tarball	59s
aarch64-linux: Cache V8 build	22s
x86_64-linux: with shared libraries	27m 14s
aarch64-darwin: with shared libraries	27m 34s
x86_64-darwin: with shared libraries	41m 54s
aarch64-linux: with shared openssl-3.6.1	26m 23s
aarch64-linux: with shared openssl-1.1.1w	24m 55s
aarch64-linux: with shared openssl-3.0.19	24m 43s
aarch64-linux: with shared openssl-4.0.0	26m 11s
aarch64-linux: with shared openssl-3.5.5	25m 20s
	3h 45m 35s

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