CDP Mode isn't freeing open socket connections after the browser has closed

### CDP Mode isn't freeing open socket connections after the browser has closed

----

If activating CDP Mode within a loop of `SB()` initializations like this:

```python
for i in range(3):
    with SB(uc=True) as sb:
        sb.activate_cdp_mode("https://example.com")
```

...then socket connections aren't being closed properly at the end of the `with` block, which leads to a growing number of open socket connections, like this:

```python
  pconn(fd=15, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56545), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=16, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56546), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
```

```python
  pconn(fd=12, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56609), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=15, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56545), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=16, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56546), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=17, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56610), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
```

```python
  pconn(fd=12, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56609), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=15, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56545), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=16, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56546), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=17, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56610), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=21, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56682), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
  pconn(fd=22, family=<AddressFamily.AF_INET: 2>, type=<SocketKind.SOCK_STREAM: 1>, laddr=addr(ip='127.0.0.1', port=56683), raddr=addr(ip='127.0.0.1', port=9222), status='CLOSE_WAIT')
```

The socket connections only get freed up after the full program has completed.

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CDP Mode isn't freeing open socket connections after the browser has closed #3685