Bump sbp-settings from 0.6.19 to 0.6.20 (#1183)

Bumps [sbp-settings](https://github.com/swift-nav/libsettings-rs) from
0.6.19 to 0.6.20.
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Cargo.lock

@@ -20,7 +20,7 @@ directories = "5"
 crossbeam = "0.8"
 rand = "0.8.5"
 parking_lot = "0.12.1"
-sbp-settings = "0.6.19"
+sbp-settings = "0.6.20"
 rust-ini = "0.19.0"
 regex = "1.9.5"
 serde_json = "1"