Merge #2584

2584: Format API keys in hexa instead of base64 r=curquiza a=ManyTheFish

This PR:
- Changes API key generation and formatting to ease the generation of the key made by our users
- updates the `uuid` crate version

The API key can now be generated in bash as below:
```sh
echo -n $HYPHENATED_UUID | openssl dgst -sha256 -hmac $MASTER_KEY
```

fixes the issue raised in [product/discussion#421](https://github.com/meilisearch/product/discussions/421#discussioncomment-3079410), this should not impact anything in documentation nor integration but ease the key generation on the user sides.

poke `@gmourier` 

Co-authored-by: ManyTheFish <many@meilisearch.com>

meilisearch-http/tests/auth/api_keys.rs

@@ -42,6 +42,7 @@ async fn add_valid_api_key() {
         "name": "indexing-key",
         "description": "Indexing API key",
         "uid": "4bc0887a-0e41-4f3b-935d-0c451dcee9c8",
+        "key": "d9e776b8412f1db6974c9a5556b961c3559440b6588216f4ea5d9ed49f7c8f3c",
         "indexes": ["products"],
         "actions": [
             "search",