Update faer requirement from 0.19.3 to 0.21.4

---
updated-dependencies:
- dependency-name: faer
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -31,7 +31,7 @@ tracing-subscriber = { version = "0.3.17", features = [
     "time",
 ] }
 config = { version = "0.15", features = ["preserve_order"] }
-faer = "0.19.3"
+faer = "0.21.4"
 faer-ext = { version = "0.2.0", features = ["nalgebra", "ndarray"] }
 pharmsol = "0.7.2"
 rand = "0.9.0"