[clang-tidy] Fix compilation of modernize-use-using check

Fix compilation issue introduced by #69102.

GitOrigin-RevId: 7a48039eb79fc887f473e80618b6bc98effea077
diff --git a/clang-tidy/modernize/UseUsingCheck.cpp b/clang-tidy/modernize/UseUsingCheck.cpp
index f5fc3ad..bb05f20 100644
--- a/clang-tidy/modernize/UseUsingCheck.cpp
+++ b/clang-tidy/modernize/UseUsingCheck.cpp
@@ -14,7 +14,7 @@
 namespace {
 
 AST_MATCHER(clang::LinkageSpecDecl, isExternCLinkage) {
-  return Node.getLanguage() == clang::LinkageSpecDecl::lang_c;
+  return Node.getLanguage() == clang::LinkageSpecLanguageIDs::C;
 }
 } // namespace