AK: Replace C-style casts

Author: https://github.com/AtkinsSJ
Commit: 067d0689c5
Pull-request: https://github.com/SerenityOS/serenity/pull/17745
Reviewed-by: https://github.com/kleinesfilmroellchen

AK/StringHash.h

@@ -14,7 +14,7 @@ constexpr u32 string_hash(char const* characters, size_t length, u32 seed = 0)
 {
     u32 hash = seed;
     for (size_t i = 0; i < length; ++i) {
-        hash += (u32)characters[i];
+        hash += static_cast<u32>(characters[i]);
         hash += (hash << 10);
         hash ^= (hash >> 6);
     }