feat: update to latest Copilot LSP

Author: github-actions[bot]

copilot/js/language-server.js

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 
-const minNodeVersion = 20;
+const minNodeVersion = 22;
 
 function nodeVersionError() {
     const version = process.versions.node;

copilot/js/main.js

@@ -21,7 +21,7 @@ function M.get_editor_info()
     editorPluginInfo = {
       name = "copilot.lua",
       -- reflects version of github/copilot-language-server-release
-      version = "1.373.0",
+      version = "1.376.0",
     },
   }
   return info