Merge bitcoin/bitcoin#22309: blockstorage: Add missing atomic include

fa2d21f add missing atomic include (MarcoFalke)

Pull request description:

  `std::atomic` is used in the file, so to avoid compile issues, add the missing include.

ACKs for top commit:
  practicalswift:
    cr ACK fa2d21f
  jamesob:
    crACK bitcoin/bitcoin@fa2d21f
  hebasto:
    ACK fa2d21f, I have reviewed the code and it looks OK, I agree it can be merged.
  prayank23:
    crACK bitcoin/bitcoin@fa2d21f

Tree-SHA512: 307b15abd62006be4457b2437fb65de517c296bf0417e8acd181904eb6056dba5655dd5bc43b834bf68a087d06637f5e99ba5a6bc8be3e12388cea470dc155d0

Author: MarcoFalke

src/node/blockstorage.h

@@ -5,12 +5,13 @@
 #ifndef BITCOIN_NODE_BLOCKSTORAGE_H
 #define BITCOIN_NODE_BLOCKSTORAGE_H
 
-#include <cstdint>
-#include <vector>
-
 #include <fs.h>
 #include <protocol.h> // For CMessageHeader::MessageStartChars
 
+#include <atomic>
+#include <cstdint>
+#include <vector>
+
 class ArgsManager;
 class BlockValidationState;
 class CBlock;