refactor: don't deserialize &str from toml

The new version of the `toml` crate is based on `toml_edit` and does
not support zero copy deserialization anymore. So we need to deserialize
`String` instead of `&str` in the keympa

helix-term/src/keymap.rs

@@ -184,7 +184,7 @@ impl<'de> serde::de::Visitor<'de> for KeyTrieVisitor {
         S: serde::de::SeqAccess<'de>,
     {
         let mut commands = Vec::new();
-        while let Some(command) = seq.next_element::<&str>()? {
+        while let Some(command) = seq.next_element::<String>()? {
             commands.push(
                 command
                     .parse::<MappableCommand>()