Fix a bug of casting sizeof(slot_type) to uint16_t instead of uint32_t.

Note that in the above static_assert, we check that sizeof(slot_type) fits in a uint32_t, not a uint16_t and the field in PolicyFunctions is a uint32_t.

PiperOrigin-RevId: 756886567
Change-Id: I5ca915b814d1da6cdc1d24152b2ebde5dec9d28b

Author: ezbr

absl/container/internal/raw_hash_set.h

@@ -3607,7 +3607,7 @@ class raw_hash_set {
     static constexpr PolicyFunctions value = {
         static_cast<uint32_t>(sizeof(key_type)),
         static_cast<uint32_t>(sizeof(value_type)),
-        static_cast<uint16_t>(sizeof(slot_type)),
+        static_cast<uint32_t>(sizeof(slot_type)),
         static_cast<uint16_t>(alignof(slot_type)), SooEnabled(),
         ShouldSampleHashtablezInfoForAlloc<CharAlloc>(),
         // TODO(b/328722020): try to type erase