fix: prevent depending on aws-lc via reqwest (#1412)

Otherwise the rustls dependency might be built with both aws-lc and ring backends,
leading to the following error in the k2v_client tests when
consul-discovery feature is enabled (including the reqwest dependency):

```
Could not automatically determine the process-level CryptoProvider from Rustls crate features.
Call CryptoProvider::install_default() before this point to select a provider manually, or make sure exactly one of the 'aws-lc-rs' and 'ring' features is enabled.
See the documentation of the CryptoProvider type for more information.
```

Co-authored-by: Yureka <yuka@yuka.dev>
Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/1412
Reviewed-by: Alex <lx@deuxfleurs.fr>

Cargo.toml

@@ -113,7 +113,7 @@ kube = { version = "3.0", default-features = false, features = [
 ] }
 schemars = "1.2"
 reqwest = { version = "0.13", default-features = false, features = [
-    "rustls",
+    "rustls-no-provider",
     "json",
 ] }