chore(cargo): update to strum 0.26

Cargo.lock

@@ -4673,15 +4673,15 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "strum"
-version = "0.25.0"
+version = "0.26.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "290d54ea6f91c969195bdbcd7442c8c2a2ba87da8bf60a7ee86a235d4bc1e125"
+checksum = "723b93e8addf9aa965ebe2d11da6d7540fa2283fcea14b3371ff055f7ba13f5f"
 
 [[package]]
 name = "strum_macros"
-version = "0.25.3"
+version = "0.26.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23dc1fa9ac9c169a78ba62f0b841814b7abae11bdd047b9c58f893439e309ea0"
+checksum = "7a3417fc93d76740d974a01654a09777cb500428cc874ca9f45edfe0c4d4cd18"
 dependencies = [
  "heck",
  "proc-macro2",

Cargo.toml

@@ -85,8 +85,8 @@ serde = { version = "1.0", features = ["derive"] }
 sha-1 = "0.10"
 sha2 = "0.10"
 smallvec = "1"
-strum = "0.25"
-strum_macros = "0.25"
+strum = "0.26"
+strum_macros = "0.26"
 tagger = "4.3.4"
 textwrap = "0.16.0"
 thiserror = "1"

src/headerdef.rs

@@ -2,7 +2,7 @@
 
 use mailparse::{MailHeader, MailHeaderMap};
 
-#[derive(Debug, Display, Clone, PartialEq, Eq, EnumVariantNames, IntoStaticStr)]
+#[derive(Debug, Display, Clone, PartialEq, Eq, IntoStaticStr)]
 #[strum(serialize_all = "kebab_case")]
 #[allow(missing_docs)]
 pub enum HeaderDef {