Update strum requirement from 0.24 to 0.25

Updates the requirements on [strum](https://github.com/Peternator7/strum) to permit the latest version.
- [Changelog](https://github.com/Peternator7/strum/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Peternator7/strum/commits)

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

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

Cargo.toml

@@ -37,7 +37,7 @@ serde_json = "1.0"
 shellexpand = "3.1"
 signal-hook = "0.3.14"
 snafu = { version = "0.7", features = ["backtraces"] }
-strum = "0.24"
+strum = "0.25"
 strum_macros = "0.24"
 surf = "2.3.2"
 tagged-base64 = { git = "https://github.com/EspressoSystems/tagged-base64.git", tag = "0.2.4" }