[disrustor] Data race in disrustor

An issue was discovered in the disrustor crate through 2020-12-17 for Rust. RingBuffer doe not properly limit the number of mutable references.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-36470
• https://github.com/sklose/disrustor/issues/1
• https://rustsec.org/advisories/RUSTSEC-2020-0150.html
• https://github.com/sklose/disrustor/commit/0be7aed40adbac51a50a3b95c815349a40d79ca6
• https://github.com/advisories/GHSA-w9r2-qrpm-4rmj