feat(teepot-crate): add libtdx_attest to dependencies

- Included `nixsgx.sgx-dcap.libtdx_attest` in the dependencies list.
- Ensures support for TDX attestation in the build environment.

teepot-crate.nix

@@ -28,6 +28,7 @@ let
       nixsgx.sgx-sdk
       nixsgx.sgx-dcap
       nixsgx.sgx-dcap.quote_verify
+      nixsgx.sgx-dcap.libtdx_attest
     ];
 
     strictDeps = true;