Fix memory leak in `owned_to_vec` (#773) #848

Job	Run time
minrust	2m 56s
miri	15m 21s
cross (i686-unknown-linux-gnu, ubuntu-latest)	1m 34s
loom	22s
cross (armv7-unknown-linux-gnueabihf, ubuntu-22.04-arm)	1m 51s
nightly	1m 36s
no-std	16s
cross (powerpc-unknown-linux-gnu, ubuntu-latest)	54s
panic=abort tests	40s
rustfmt	10s
cross (powerpc64-unknown-linux-gnu, ubuntu-latest)	41s
cross (wasm32-wasip1, ubuntu-latest)	24s
stable (ubuntu-latest)	2m 1s
tsan	1m 21s
stable (ubuntu-22.04-arm)	3m 5s
stable (macos-latest)	1m 53s
stable (windows-latest)	4m 1s
Publish Documentation	12s
	39m 18s

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