fix: add python 3.14 support, adopt pygls >=2.0.0 api

tests/conftest.py

@@ -7,7 +7,7 @@ from typing import Iterable, Tuple
 
 import pytest
 from lsprotocol.types import EXIT, SHUTDOWN
-from pygls.server import LanguageServer
+from pygls.lsp.server import LanguageServer
 
 from cmake_language_server.server import CMakeLanguageServer
 
@@ -54,7 +54,7 @@ def client_server() -> Iterable[Tuple[LanguageServer, CMakeLanguageServer]]:
     if hasattr(client.loop, "_signal_handlers"):
         client.loop._signal_handlers.clear()
 
-    client.lsp.send_request(SHUTDOWN)  # type:ignore[no-untyped-call]
-    client.lsp.notify(EXIT)
+    client.protocol.send_request(SHUTDOWN)  # type:ignore[no-untyped-call]
+    client.protocol.notify(EXIT)
     client_thread.join()
     server_thread.join()