chore: run new integration test for mempool mining fairness

Author: jcnelson

.github/actions/bitcoin-int-tests/Dockerfile.bitcoin-tests

@@ -32,4 +32,5 @@ RUN cargo test -- --test-threads 1 --ignored tests::neon_integrations::runtime_o
 RUN cargo test -- --test-threads 1 --ignored tests::neon_integrations::antientropy_integration_test
 RUN cargo test -- --test-threads 1 --ignored tests::neon_integrations::filter_low_fee_tx_integration_test
 RUN cargo test -- --test-threads 1 --ignored tests::neon_integrations::filter_long_runtime_tx_integration_test
+RUN cargo test -- --test-threads 1 --ignored tests::neon_integrations::mining_transactions_is_fair