chore: refer to h2 as dep:h2 (#2919)

Author: seanmonstar

Cargo.toml

@@ -40,7 +40,7 @@ default = ["default-tls", "charset", "http2", "system-proxy"]
 
 default-tls = ["rustls"]
 
-http2 = ["h2", "hyper/http2", "hyper-util/http2", "hyper-rustls?/http2"]
+http2 = ["dep:h2", "hyper/http2", "hyper-util/http2", "hyper-rustls?/http2"]
 
 rustls = ["__rustls-aws-lc-rs", "dep:rustls-platform-verifier", "__rustls"]
 rustls-no-provider = ["dep:rustls-platform-verifier", "__rustls"]