fix: update patched version for 2019-0028

This patch updates the `RUSTSEC-2019-0028` advisory to show a patched
version is available. The patch was added [in PR 5554](google/flatbuffers#5554),
and released with version `0.6.1`.

Author: rockstar

crates/flatbuffers/RUSTSEC-2019-0028.toml

@@ -16,4 +16,5 @@ allows to violate these requirements and invoke undefined behaviour in safe code
 
 [versions]
 patched = []
+patched = [">= 0.6.1"]
 unaffected = ["< 0.4.0"]