CLI: better support config dir lookup on Windows

There's an issue with `home_dir()` in the rust stdlib for Windows
currently. A fix is coming in Rust 1.86. In the meantime let's use what
cargo uses.

svix-cli/Cargo.toml

@@ -22,6 +22,7 @@ concolor-clap = "0.1.0"
 dialoguer = "0.11.0"
 figment = { version = "0.10.19", features = ["toml", "env"] }
 futures-util = "0.3.31"
+home = "0.5.11"
 http = "1.2.0"
 # Reduce compile times for idna (we don't need the fastest possible impl of UTS 46)
 # As per https://github.com/hsivonen/idna_adapter?tab=readme-ov-file#opting-to-use-unicode-rs

svix-cli/src/config.rs

@@ -76,9 +76,9 @@ fn get_folder() -> Result<PathBuf> {
     let pb = match config_path {
         Ok(path) => PathBuf::from(path),
         Err(_e) => {
-            // FIXME: home_dir() can give incorrect results on Windows. Docs recommend "use a crate instead"
-            #[allow(deprecated)]
-            std::env::home_dir().ok_or_else(|| anyhow::anyhow!("unable to find config path"))?
+            // N.b. per <https://github.com/rust-lang/cargo/blob/master/crates/home/README.md> the
+            // stdlib should be fixed as of Rust 1.86.
+            home::home_dir().ok_or_else(|| anyhow::anyhow!("unable to find config path"))?
         }
     };
     Ok(pb.join(".config").join("svix"))