[ssl] Deprecate RAND_egd (#15572)

Author: donbarbos

stdlib/_ssl.pyi

@@ -55,6 +55,7 @@ if sys.version_info < (3, 12):
     def RAND_pseudo_bytes(n: int, /) -> tuple[bytes, bool]: ...
 
 if sys.version_info < (3, 10):
+    @deprecated("Unsupported by OpenSSL since 1.1.1; removed in Python 3.10.")
     def RAND_egd(path: str) -> None: ...
 
 def RAND_status() -> bool: ...