Bump arrayvec from 0.4.12 to 0.7.4

Bumps [arrayvec](https://github.com/bluss/arrayvec) from 0.4.12 to 0.7.4.
- [Changelog](https://github.com/bluss/arrayvec/blob/master/CHANGELOG.md)
- [Commits](bluss/arrayvec@0.4.12...0.7.4)

---
updated-dependencies:
- dependency-name: arrayvec
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -10,7 +10,7 @@ approx = "0.5"
 factorial = { git = "https://github.com/berquist/factorial", rev = "0500498cdcc4f19d04111e3b3fc085c31a627300" }
 num-integer = "0.1"
 # num-traits = "*"
-arrayvec = "0.4"
+arrayvec = "0.7"
 GSL = "7.0"
 cpython = "0.2"
 serde = { version = "1.0", features = [ "derive" ] }