follow up to #4633

See
https://github.com/cometbft/cometbft/actions/runs/12247740137/job/34188217504

<details>
<summary>DATA RACE</summary>

==================
WARNING: DATA RACE
Write at 0x00c00028f110 by goroutine 507:
  runtime.mapassign_faststr()
/opt/hostedtoolcache/go/1.23.1/x64/src/runtime/map_faststr.go:223 +0x0
  github.com/cometbft/cometbft/internal/blocksync.(*BlockPool).banPeer()
/home/runner/work/cometbft/cometbft/internal/blocksync/pool.go:433
+0x16f

github.com/cometbft/cometbft/internal/blocksync.(*BlockPool).RemovePeerAndRedoAllPeerRequests()
/home/runner/work/cometbft/cometbft/internal/blocksync/pool.go:266
+0x192

github.com/cometbft/cometbft/internal/blocksync.TestBlockPoolMaliciousNode.func4()
/home/runner/work/cometbft/cometbft/internal/blocksync/pool_test.go:353
+0x1ee

Previous read at 0x00c00028f110 by goroutine 501:
  runtime.mapaccess1_faststr()
/opt/hostedtoolcache/go/1.23.1/x64/src/runtime/map_faststr.go:13 +0x0

github.com/cometbft/cometbft/internal/blocksync.(*BlockPool).isPeerBanned()
/home/runner/work/cometbft/cometbft/internal/blocksync/pool.go:428
+0x128c

github.com/cometbft/cometbft/internal/blocksync.TestBlockPoolMaliciousNode()
/home/runner/work/cometbft/cometbft/internal/blocksync/pool_test.go:381
+0x1[20](https://github.com/cometbft/cometbft/actions/runs/12247740137/job/34188217504#step:6:21)5
  testing.tRunner()
/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:1743 +0x44

Goroutine 507 (running) created at:

github.com/cometbft/cometbft/internal/blocksync.TestBlockPoolMaliciousNode()
/home/runner/work/cometbft/cometbft/internal/blocksync/pool_test.go:341
+0xdc4
  testing.tRunner()
/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:1743 +0x44

Goroutine 501 (running) created at:
  testing.(*T).Run()
/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:1743 +0x825
  testing.runTests.func1()

/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:[21](https://github.com/cometbft/cometbft/actions/runs/12247740137/job/34188217504#step:6:22)68
+0x85
  testing.tRunner()
/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:1690
+0x[22](https://github.com/cometbft/cometbft/actions/runs/12247740137/job/34188217504#step:6:23)6
  testing.runTests()

/opt/hostedtoolcache/go/1.[23](https://github.com/cometbft/cometbft/actions/runs/12247740137/job/34188217504#step:6:24).1/x64/src/testing/testing.go:2166
+0x8be
  testing.(*M).Run()
/opt/hostedtoolcache/go/1.23.1/x64/src/testing/testing.go:2034 +0xf17
  main.main()
      _testmain.go:83 +

</details>

(cherry picked from commit 2b1db1c)