Contracts: stabilize sr25519 (#2920)

Integration tests in ink!:
https://github.com/paritytech/ink/tree/master/integration-tests/sr25519-verification

prdoc/pr_2920.prdoc

@@ -0,0 +1,11 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Contracts: Stabilize sr25519_verify host function
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      Removed the `#[unstable]` attrribute on `sr25519_verify` host function.
+
+crates: ["pallet-contracts"]

substrate/frame/contracts/src/wasm/runtime.rs

@@ -2229,7 +2229,6 @@ pub mod env {
 
 	/// Verify a sr25519 signature
 	/// See [`pallet_contracts_uapi::HostFn::sr25519_verify`].
-	#[unstable]
 	fn sr25519_verify(
 		ctx: _,
 		memory: _,