Update fundsp requirement from 0.15 to 0.16

Updates the requirements on [fundsp](https://github.com/SamiPerttu/fundsp) to permit the latest version.
- [Changelog](https://github.com/SamiPerttu/fundsp/blob/master/CHANGES.md)
- [Commits](https://github.com/SamiPerttu/fundsp/commits)

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

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

Cargo.toml

@@ -19,7 +19,7 @@ bevy_audio = ["bevy/bevy_audio", "bevy/wav", "rodio"]
 oddio = ["bevy_oddio"]
 
 [dependencies]
-fundsp = "0.15"
+fundsp = "0.16"
 cpal = "0.15"
 once_cell = "1.13"
 rodio = { version = "0.17.1", default-features = false, features = ["wav"], optional = true }