Use a zero mtime for data.sh

Its a temp file and that way no chance of the time being in the future

kittens/ssh/main.py

@@ -86,7 +86,7 @@ def normalize_tarinfo(tarinfo: tarfile.TarInfo) -> tarfile.TarInfo:
 
     def add_data_as_file(tf: tarfile.TarFile, arcname: str, data: Union[str, bytes]) -> tarfile.TarInfo:
         ans = tarfile.TarInfo(arcname)
-        ans.mtime = int(time.time())
+        ans.mtime = 0
         ans.type = tarfile.REGTYPE
         if isinstance(data, str):
             data = data.encode('utf-8')