Merge bitcoin/bitcoin#32187: refactor: Remove spurious virtual from final ~CZMQNotificationInterface

fa69c42 refactor: Remove spurious virtual from final ~CZMQNotificationInterface (MarcoFalke)

Pull request description:

  `virtual` does not make sense here, because:

  * The class is `final`, thus the destructor isn't overridden in a derived class
  * The destructor also isn't overriding the destructor of the base, clarified in commit 2b3ea39
  * Clang 21 may warn about this

  ```
  src/zmq/zmqnotificationinterface.h:25:13: error: virtual method '~CZMQNotificationInterface' is inside a 'final' class and can never be overridden [-Werror,-Wunnecessary-virtual-specifier]
     25 |     virtual ~CZMQNotificationInterface();
        |             ^
  ```

  Fix all issues by removing it.

ACKs for top commit:
  davidgumberg:
    crACK bitcoin/bitcoin@fa69c42
  janb84:
    ACK [fa69c42](bitcoin/bitcoin@fa69c42)
  TheCharlatan:
    ACK fa69c42

Tree-SHA512: 26ea977f31fe24c116d68dea6c583de7c6fc480877e1baefcde11db4ac191e352027d492ee6ad69a60fe4ff537e0841c638b3a3e81356d9e00c60030845fc96e

Author: fanquake

src/zmq/zmqnotificationinterface.h

@@ -1,4 +1,4 @@
-// Copyright (c) 2015-2022 The Bitcoin Core developers
+// Copyright (c) 2015-present The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -22,7 +22,7 @@ struct NewMempoolTransactionInfo;
 class CZMQNotificationInterface final : public CValidationInterface
 {
 public:
-    virtual ~CZMQNotificationInterface();
+    ~CZMQNotificationInterface();
 
     std::list<const CZMQAbstractNotifier*> GetActiveNotifiers() const;