fix(jni): bump to jni to 0.11 & remove unsafe impl (#10394)

parity-clib/Cargo.toml

@@ -11,7 +11,7 @@ crate-type = ["cdylib", "staticlib"]
 
 [dependencies]
 futures = "0.1.6"
-jni = { version = "0.10.1", optional = true }
+jni = { version = "0.11", optional = true }
 panic_hook = { path = "../util/panic-hook" }
 parity-ethereum = { path = "../", default-features = false }
 tokio = "0.1.11"

parity-clib/src/java.rs

@@ -36,9 +36,6 @@ struct JavaCallback<'a> {
 	method_descriptor: &'a str,
 }
 
-unsafe impl<'a> Send for JavaCallback<'a> {}
-unsafe impl<'a> Sync for JavaCallback<'a> {}
-
 impl<'a> JavaCallback<'a> {
 	fn new(jvm: JavaVM, callback: GlobalRef) -> Self {
 		Self {