Update CI image to macOS 14

Catch2 has long since required a standard newer than C++98 so we
can safely ignore any warnings related to such old standards.

.github/workflows/mac-builds.yml

@@ -4,11 +4,7 @@ on: [push, pull_request]
 
 jobs:
   build:
-    # macos-12 updated to a toolchain that crashes when linking the
+    runs-on: macos-14
-    # test binary. This seems to be a known bug in that version,
-    # and will eventually get fixed in an update. After that, we can go
-    # back to newer macos images.
-    runs-on: macos-11
     strategy:
       matrix:
         cxx:

tests/SelfTest/TestRegistrations.cpp

@@ -20,7 +20,6 @@ CATCH_REGISTER_TAG_ALIAS("[@tricky]", "[tricky]~[.]")
 #ifdef __clang__
 #   pragma clang diagnostic ignored "-Wpadded"
 #   pragma clang diagnostic ignored "-Wweak-vtables"
-#   pragma clang diagnostic ignored "-Wc++98-compat"
 #endif
 
 /**

tests/SelfTest/UsageTests/Misc.tests.cpp

@@ -11,11 +11,6 @@
 #include <catch2/internal/catch_config_wchar.hpp>
 #include <catch2/internal/catch_windows_h_proxy.hpp>
 
-#ifdef __clang__
-#   pragma clang diagnostic ignored "-Wc++98-compat"
-#   pragma clang diagnostic ignored "-Wc++98-compat-pedantic"
-#endif
-
 
 #include <iostream>
 #include <cerrno>