refactor: use Span for SipHash::Write

Co-authored-by: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>

src/blockfilter.cpp

@@ -27,7 +27,7 @@ static const std::map<BlockFilterType, std::string> g_filter_types = {
 uint64_t GCSFilter::HashToRange(const Element& element) const
 {
     uint64_t hash = CSipHasher(m_params.m_siphash_k0, m_params.m_siphash_k1)
-        .Write(element.data(), element.size())
+        .Write(element)
         .Finalize();
     return FastRange64(hash, m_F);
 }