internal/any_invocable: Remove suppresion of false positive -Wmaybe-uninitialized on GCC 12

These don't seem to be a problem ever since we switched from SFINAE to `if constexpr`.

PiperOrigin-RevId: 728221117
Change-Id: I26f03ac6e0bed6670e6274c68327274978b2b095

Author: derekmauro

absl/functional/internal/any_invocable.h

@@ -119,15 +119,7 @@ ReturnType InvokeR(F&& f, P&&... args) {
   if constexpr (std::is_void_v<ReturnType>) {
     std::invoke(std::forward<F>(f), std::forward<P>(args)...);
   } else {
-    // GCC 12 has a false-positive -Wmaybe-uninitialized warning here.
-#if ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(12, 0)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
-#endif
     return std::invoke(std::forward<F>(f), std::forward<P>(args)...);
-#if ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(12, 0)
-#pragma GCC diagnostic pop
-#endif
   }
 }