Bump the rust-deps group with 3 updates (#59)

---
updated-dependencies:
- dependency-name: strum
  dependency-type: direct:production
  dependency-group: rust-deps
- dependency-name: strum_macros
  dependency-type: direct:production
  dependency-group: rust-deps
- dependency-name: iso8601
  dependency-type: direct:production
  dependency-group: rust-deps
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -12,10 +12,10 @@ homepage = "https://github.com/pydantic/speedate/"
 repository = "https://github.com/pydantic/speedate/"
 
 [dependencies]
-strum = { version = "0.25", features = ["derive"] }
-strum_macros = "0.25"
+strum = { version = "0.26", features = ["derive"] }
+strum_macros = "0.26"
 
 [dev-dependencies]
 chrono = "0.4.19"
-iso8601 = "0.4.1"
+iso8601 = "0.6.1"
 paste = "1.0.7"