fix abc error for solana auth backend

Author: tomvictor

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "aws_packages"
-version = "0.0.19"
+version = "0.0.20"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

aws_packages/auth/solana/auth_backend.py

@@ -32,6 +32,10 @@ def get_access_token(self, user: User) -> str:
         token = AccessToken()
         return token.get_access_token(user)
 
+    def get_refresh_token(self, user: User, token: str) -> str:
+        """Get the refresh token for the given user"""
+        raise NotImplementedError("get_refresh_token is not implemented")
+
 
 solana_auth_backend = SolanaAuthBackend(
     url="https://ic0.app",