crypto: fix use-after-free risk in ManagedX509 assignment #5466

Job	Run time
Build slim tarball	3m 2s
aarch64-linux: with shared libraries	18m 44s
x86_64-darwin: with shared libraries	42m 59s
x86_64-linux: with shared libraries	21m 55s
aarch64-darwin: with shared libraries	19m 37s
	1h 46m 17s

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