cargo audit failures due to jsonwebtoken 7.2.0

[brayniac]

Running cargo audit shows the following issues:

    Fetching advisory database from `https://github.com/RustSec/advisory-db.git`
      Loaded 404 security advisories (from /home/brian/.cargo/advisory-db)
    Updating crates.io index
    Scanning Cargo.lock for vulnerabilities (145 crate dependencies)
Crate:         chrono
Version:       0.4.19
Title:         Potential segfault in `localtime_r` invocations
Date:          2020-11-10
ID:            RUSTSEC-2020-0159
URL:           https://rustsec.org/advisories/RUSTSEC-2020-0159
Solution:      No safe upgrade is available!
Dependency tree: 
chrono 0.4.19
└── simple_asn1 0.4.1
    └── jsonwebtoken 7.2.0
        └── momento 0.1.0

Crate:         time
Version:       0.1.43
Title:         Potential segfault in the time crate
Date:          2020-11-18
ID:            RUSTSEC-2020-0071
URL:           https://rustsec.org/advisories/RUSTSEC-2020-0071
Solution:      Upgrade to >=0.2.23
Dependency tree: 
time 0.1.43
└── chrono 0.4.19
    └── simple_asn1 0.4.1
        └── jsonwebtoken 7.2.0
            └── momento 0.1.0

error: 2 vulnerabilities found!