chore: replace async-std with tokio (#813)

Signed-off-by: Zomatree <me@zomatree.live>

crates/core/permissions/src/test.rs

@@ -4,7 +4,7 @@ use crate::{
     DEFAULT_PERMISSION_SERVER, DEFAULT_PERMISSION_VIEW_ONLY,
 };
 
-#[async_std::test]
+#[tokio::test]
 async fn validate_user_permissions() {
     /// Scenario in which we are friends with a user
     /// and we have a DM channel open with them
@@ -102,7 +102,7 @@ async fn validate_user_permissions() {
     }
 }
 
-#[async_std::test]
+#[tokio::test]
 async fn validate_group_permissions() {
     /// Scenario in which we are in a group channel with only talking permission
     struct Scenario {}
@@ -202,7 +202,7 @@ async fn validate_group_permissions() {
     }
 }
 
-#[async_std::test]
+#[tokio::test]
 async fn validate_server_permissions() {
     /// Scenario in which we are in a server channel where:
     /// - the server grants reading history and sending messages by default
@@ -314,7 +314,7 @@ async fn validate_server_permissions() {
     }
 }
 
-#[async_std::test]
+#[tokio::test]
 async fn validate_timed_out_member() {
     /// Scenario in which we are in a server that we have been timed out from
     struct Scenario {}