gossipsub tracks disconnected peers

### Describe the bug

starting from v1.34.0, lodestar target peer is 200 but gossip tracks more peers than that

this issue happened starting v1.33.0, does not look like a leak as it does not keep increasing

### Expected behavior

gossipsub should track ~200 peers starting v1.34.0

### Steps to reproduce

_No response_

### Additional context

_No response_

### Operating system

Linux

### Lodestar version or commit hash

v1.33.0