Assign RUSTSEC IDs (#342)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

crates/rand_core/RUSTSEC-0000-0000.toml renamed to crates/rand_core/RUSTSEC-2019-0035.toml

@@ -1,5 +1,5 @@
 [advisory]
-id = "RUSTSEC-0000-0000"
+id = "RUSTSEC-2019-0035"
 package = "rand_core"
 date = "2019-04-19"
 informational = "unsound"