Update code samples [skip ci]

Author: github-actions[bot]

snippets/samples/code_samples_getting_started_add_documents.mdx

@@ -192,7 +192,7 @@ namespace Meilisearch_demo
 ```text Rust
 // In your .toml file:
   [dependencies]
-  meilisearch-sdk = "0.29.0"
+  meilisearch-sdk = "0.29.1"
   # futures: because we want to block on futures
   futures = "0.3"
   # serde: required if you are going to use documents