🧹 fix(sidecar): use infallible KeyHandle conversion

`ObjectHandle` -> `KeyHandle` cannot fail, so `try_from` plus an
`anyhow::Context` wrapper was dead error handling. clippy's
`unnecessary_fallible_conversions` lint made this a hard error under
`-D warnings`, which this crate escalates further via `pedantic = "deny"`.

Pre-existing on main; left out of the dependency commit to keep that
diff scoped to dependencies.

Verified on aarch64-linux (rust:1.94-trixie with libtss2-dev, swtpm,
tpm2-tools) because tss-esapi-sys ships no aarch64-darwin bindings:
  cargo clippy --all-targets -- -D warnings   exit 0
  cargo test                                  24 passed, 0 failed

Author: luiscosio

sidecar/src/identity.rs

@@ -256,7 +256,7 @@ fn load_persistent_key(ctx: &mut Context, handle: u32) -> anyhow::Result<KeyHand
     let loaded = ctx
         .tr_from_tpm_public(persistent.into())
         .with_context(|| format!("loading persistent TPM handle 0x{handle:08x}"))?;
-    KeyHandle::try_from(loaded).context("converting TPM handle to key handle")
+    Ok(KeyHandle::from(loaded))
 }
 
 fn certificate_spki(cert: &CertificateDer<'_>) -> anyhow::Result<Vec<u8>> {