Use COINBASE_MATURITY constant in functional tests.

test/functional/feature_taproot.py

@@ -5,6 +5,7 @@
 # Test Taproot softfork (BIPs 340-342)
 
 from test_framework.blocktools import (
+    COINBASE_MATURITY,
     create_coinbase,
     create_block,
     add_witness_commitment,
@@ -1440,7 +1441,7 @@ class TaprootTest(BitcoinTestFramework):
     def run_test(self):
         # Post-taproot activation tests go first (pre-taproot tests' blocks are invalid post-taproot).
         self.log.info("Post-activation tests...")
-        self.nodes[1].generate(101)
+        self.nodes[1].generate(COINBASE_MATURITY + 1)
         self.test_spenders(self.nodes[1], spenders_taproot_active(), input_counts=[1, 2, 2, 2, 2, 3])
 
         # Re-connect nodes in case they have been disconnected