Add explicit cast to size_t for GetGrowthLeftTotalBigCapacity.

PiperOrigin-RevId: 932456168
Change-Id: I9fbc1205bb9d40b7470dd76af017eac735973c8d

absl/container/internal/raw_hash_set.cc

diff --git a/absl/container/internal/raw_hash_set.cc b/absl/container/internal/raw_hash_set.cc
index dc58245..80efa1e 100644
--- a/absl/container/internal/raw_hash_set.cc
+++ b/absl/container/internal/raw_hash_set.cc
@@ -386,7 +386,8 @@
   if (capacity <= GrowthInfoLowerBound::kMaxGrowthLeftLowerBound) {
     return GetGrowthLeftLowerBound();
   } else {
-    return GetGrowthLeftTotalBigCapacity(full_growth_info_ptr());
+    return static_cast<size_t>(
+        GetGrowthLeftTotalBigCapacity(full_growth_info_ptr()));
   }
 }