Make webpki-roots optional dependency (#1508)

Author: tottoto

Cargo.toml

@@ -35,7 +35,7 @@ compat-3-3-0 = []
 bson-2 = ["dep:bson2", "mongocrypt/bson-2"]
 bson-3 = ["dep:bson3", "mongocrypt/bson-3"]
 sync = []
-rustls-tls = ["dep:rustls", "dep:tokio-rustls"]
+rustls-tls = ["dep:rustls", "dep:tokio-rustls", "dep:webpki-roots"]
 openssl-tls = ["dep:openssl", "dep:openssl-probe", "dep:tokio-openssl"]
 dns-resolver = ["dep:hickory-resolver", "dep:hickory-proto"]
 cert-key-password = ["dep:pem", "dep:pkcs8"]
@@ -125,7 +125,7 @@ thiserror = "2"
 tokio-openssl = { version = "0.6.3", optional = true }
 tracing = { version = "0.1.36", optional = true }
 typed-builder = "0.22.0"
-webpki-roots = "1"
+webpki-roots = { version = "1", optional = true }
 zstd = { version = "0.11.2", optional = true }
 macro_magic = "0.5.1"
 rustversion = "1.0.20"