Merge bitcoin/bitcoin#28085: refactor: use Span for SipHash::Write

7d92b1430a refactor: use Span for SipHash::Write (Sebastian Falbesoner)

Pull request description:

  This simple refactoring PR changes the interface for the `SipHash` arbitrary-data `Write` method to take a `Span<unsigned char>` instead of having to pass data and length. (`Span<std::byte>` seems to be more modern, but vectors of `unsigned char` are still used prety much everywhere where SipHash is called, and I didn't find it very appealing having to clutter the code with `Make(Writable)ByteSpan` helpers).

ACKs for top commit:
  sipa:
    utACK 7d92b1430a
  MarcoFalke:
    lgtm ACK 7d92b1430a
  achow101:
    ACK 7d92b1430a

Tree-SHA512: f17a27013c942aead4b09f5a64e0c3ff8dbc7e83fe63eb9a2e3ace8be9921c9cbba3ec67e3e83fbe3332ca941c42370efd059e702c060f9b508307e9657c66f2

src/test/fuzz/addrman.cpp

@@ -171,8 +171,8 @@ public:
             hasher.Write(a.source.GetNetwork());
             hasher.Write(addr_key.size());
             hasher.Write(source_key.size());
-            hasher.Write(addr_key.data(), addr_key.size());
-            hasher.Write(source_key.data(), source_key.size());
+            hasher.Write(addr_key);
+            hasher.Write(source_key);
             return (size_t)hasher.Finalize();
         };