tests: bump C++ requirement of has_header_symbol

Boost now requires C++ 14, as of 1.82
diff --git a/test cases/common/103 has header symbol/meson.build b/test cases/common/103 has header symbol/meson.build
index 4f493e8..ecba2c5 100644
--- a/test cases/common/103 has header symbol/meson.build
+++ b/test cases/common/103 has header symbol/meson.build
@@ -1,7 +1,10 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright © 2024 Intel Corporation
+
 project(
   'has header symbol',
   'c', 'cpp',
-  default_options : ['cpp_std=c++11'],
+  default_options : ['cpp_std=c++14'],
 )
 
 cc = meson.get_compiler('c')