fix(rust): Remove default features from reqwest dependency

This change removes the default features (specifically native-tls) from the reqwest
dependency in the Rust client generator. This allows users to explicitly choose
their TLS backend without automatically including openssl-sys as a transitive dependency.

Users can now explicitly enable TLS backends using feature flags:
- native-tls
- rustls-tls
- default-tls

Fixes OpenAPITools#21933

Author: JMLX42

modules/openapi-generator/src/main/resources/rust/Cargo.mustache

@@ -88,7 +88,7 @@ google-cloud-token = "^0.1"
 {{/supportAsync}}
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]
 {{/reqwest}}
@@ -109,7 +109,7 @@ mockall = { version = "^0.13", optional = true}
 bon = { version = "2.3", optional = true }
 {{/useBonBuilder}}
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]
 {{#mockall}}

samples/client/others/rust/reqwest-regression-16119/Cargo.toml

@@ -15,6 +15,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "blocking", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]

samples/client/others/rust/reqwest/api-with-ref-param/Cargo.toml

@@ -15,6 +15,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]

samples/client/others/rust/reqwest/composed-oneof/Cargo.toml

@@ -15,6 +15,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "blocking", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]

samples/client/others/rust/reqwest/emptyObject/Cargo.toml

@@ -15,6 +15,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "blocking", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]

samples/client/others/rust/reqwest/oneOf-array-map/Cargo.toml

@@ -15,6 +15,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "blocking", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]

samples/client/others/rust/reqwest/oneOf-reuseRef/Cargo.toml

@@ -14,6 +14,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "blocking", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]

samples/client/others/rust/reqwest/oneOf/Cargo.toml

@@ -15,6 +15,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "blocking", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]

samples/client/petstore/rust/reqwest-trait/petstore/Cargo.toml

@@ -17,7 +17,7 @@ async-trait = "^0.1"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "multipart"] }
 mockall = { version = "^0.13", optional = true}
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]
 mockall = ["dep:mockall"]

samples/client/petstore/rust/reqwest/name-mapping/Cargo.toml

@@ -14,6 +14,6 @@ url = "^2.5"
 reqwest = { version = "^0.12", default-features = false, features = ["json", "blocking", "multipart"] }
 
 [features]
-default = ["native-tls"]
+default = []
 native-tls = ["reqwest/native-tls"]
 rustls-tls = ["reqwest/rustls-tls"]