Remove default dependencies on ring, webpki-roots (Azure#2090)

Since `reqwest` 0.12.9 (based on our current Cargo.lock) uses `native-tls` by default, with these changes we no longer have a dependency on `ring` or `webpki-roots`.

See <https://github.com/seanmonstar/reqwest/blob/v0.12.9/README.md#requirements>.

Author: heaths

Cargo.lock

@@ -57,10 +57,11 @@ xml = ["typespec_client_core/xml"]
 features = [
   "hmac_openssl",
   "hmac_rust",
+  "reqwest",
   "reqwest_gzip",
   "reqwest_rustls",
-  "reqwest",
   "test",
   "tokio_fs",
+  "tokio_sleep",
   "xml",
 ]

sdk/core/azure_core/Cargo.toml

@@ -46,13 +46,13 @@ tracing-subscriber.workspace = true
 typespec_macros.path = "../typespec_macros"
 
 [features]
-default = ["http", "json", "reqwest", "reqwest_gzip", "reqwest_rustls"]
+default = ["http", "json", "reqwest", "reqwest_gzip"]
 derive = ["dep:typespec_macros"]
 http = ["dep:http-types", "typespec/http"]
 json = ["typespec/json"]
-reqwest = ["dep:reqwest", "reqwest/default-tls"]
+reqwest = ["dep:reqwest"]
 reqwest_gzip = ["reqwest/gzip"]
-reqwest_rustls = ["reqwest/rustls-tls"]
+reqwest_rustls = ["reqwest/rustls-tls-native-roots"]
 tokio_fs = ["tokio/fs", "tokio/sync", "tokio/io-util"]
 tokio_sleep = ["tokio/time"]
 xml = ["dep:quick-xml"]