Merge bitcoin/bitcoin#22630: test: Add missing include

6666ec9 test: Add missing include (MarcoFalke)

Pull request description:

  Fix the silent merge conflict introduced in commit 7d60f7e

ACKs for top commit:
  fanquake:
    ACK 6666ec9 - fixes:

Tree-SHA512: c712715db4a41cf6ed991fb35482d8fd9016b5a27e1309654018219ebbfd8d4f98a389bdf5d7b792e7a4690928aeef943c716465b0c5e00f70320ad2e134ebb5

Author: fanquake

src/test/miner_tests.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2020 The Bitcoin Core developers
+// Copyright (c) 2011-2021 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -16,6 +16,7 @@
 #include <util/system.h>
 #include <util/time.h>
 #include <validation.h>
+#include <versionbits.h>
 
 #include <test/util/setup_common.h>