Ensure compatibility with httpx v0.28.0+

SSL errors are thrown slightly different in httpx v0.28.0+ - Ensure
these are caught and re-raised as TlsErrors.

Author: carlsmedstad

elastic_transport/_node/_http_httpx.py

@@ -158,6 +158,13 @@ async def perform_request(  # type: ignore[override]
                 )
             elif isinstance(e, ssl.SSLError):
                 err = TlsError(str(e), errors=(e,))
+            # Detect SSL errors for httpx v0.28.0+
+            elif isinstance(e, httpx.ConnectError) and e.__cause__:
+                context = e.__cause__.__context__
+                if isinstance(context, ssl.SSLError):
+                    err = TlsError(str(context), errors=(e,))
+                else:
+                    err = ConnectionError(str(e), errors=(e,))
             else:
                 err = ConnectionError(str(e), errors=(e,))
             self._log_request(