Add an explicit cast for an integral promotion that MSVC warns about.

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index 852a6ae26df81f198385f9afa9b89627a31f58c6..26c522b89f2025e06f56ffd4878aabdf51d42dbc 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -213,7 +213,7 @@ class BitField {
 
   // Tells whether the provided value fits into the bit field.
   static bool is_valid(T value) {
-    return (static_cast<uint32_t>(value) & ~kMax) == 0;
+    return (static_cast<uint32_t>(value) & ~static_cast<uint32_t>(kMax)) == 0;
   }
 
   // Returns a uint32_t with the bit field value encoded.