build(deps): update env_logger requirement from 0.10 to 0.11 in /demo

Updates the requirements on [env_logger](https://github.com/rust-cli/env_logger) to permit the latest version.
- [Release notes](https://github.com/rust-cli/env_logger/releases)
- [Changelog](https://github.com/rust-cli/env_logger/blob/main/CHANGELOG.md)
- [Commits](rust-cli/env_logger@v0.10.0...v0.11.3)

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

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

demo/Cargo.toml

@@ -39,5 +39,5 @@ deep_filter = { path = "../libDF/", default-features = false, features = [
 ndarray = "^0.15"
 rubato = "0.15"
 ringbuf = "0.3"
-env_logger = "0.10"
+env_logger = "0.11"
 log = { version = "0.4", features = ["std"] }