Fix abort() getting stuck when being passed a reference

- It was possible to pass a reference to data_stream, instead of
  ownership, which the code intended.
- Require 'static, ie. normal references cannot be passed anymore.
- Could stop old, buggy code from compiling.

suppaftp/src/async_ftp/mod.rs

@@ -523,7 +523,7 @@ where
     /// abort the previous FTP service command
     pub async fn abort<R>(&mut self, data_stream: R) -> FtpResult<()>
     where
-        R: Read + std::marker::Unpin,
+        R: Read + std::marker::Unpin + 'static,
     {
         debug!("Aborting active file transfer");
         self.perform(Command::Abor).await?;

suppaftp/src/sync_ftp/mod.rs

@@ -522,7 +522,7 @@ where
     }
 
     /// abort the previous FTP service command
-    pub fn abort(&mut self, data_stream: impl Read) -> FtpResult<()> {
+    pub fn abort(&mut self, data_stream: impl Read + 'static) -> FtpResult<()> {
         debug!("Aborting active file transfer");
         self.perform(Command::Abor)?;
         // Drop stream NOTE: must be done first, otherwise server won't return any response