ffi: prevent premature GC of DynamicLibrary #6245

Job	Run time
Build slim tarball	1m 10s
collect-openssl-versions	7s
x86_64-darwin: with shared libraries	32m 54s
aarch64-darwin: with shared libraries	28m 56s
aarch64-linux: Cache V8 build	25s
x86_64-linux: with shared libraries	27m 30s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	23m 18s
aarch64-linux: with shared openssl_4_0 (4.0.0)	23m 25s
aarch64-linux: with shared openssl_3_5 (3.5.5)	23m 15s
aarch64-linux: with shared openssl_3 (3.0.19)	23m 37s
aarch64-linux: with shared openssl_3_6 (3.6.1)	23m 33s
	3h 28m 10s

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