fix(SessinPoolExample.py): change port

[LaoshuBaby]

What type of PR is this?

• [x] bug
• [ ] feature
• [ ] enhancement

What problem(s) does this PR solve?

Issue(s) number:

None

Current code will cause this error:

PS D:\Git\Playground\nebula-python\example> py SessinPoolExample.py
Traceback (most recent call last):
  File "C:\Environment\Python\Python311\Lib\site-packages\nebula3\fbthrift\transport\TSocket.py", line 286, in open
    handle.connect(address)
TimeoutError: timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\Git\Playground\nebula-python\example\SessinPoolExample.py", line 27, in <module>
    conn.open(ip, port, 1000)
  File "C:\Environment\Python\Python311\Lib\site-packages\nebula3\gclient\net\Connection.py", line 52, in open
    self.open_SSL(ip, port, timeout, None)
  File "C:\Environment\Python\Python311\Lib\site-packages\nebula3\gclient\net\Connection.py", line 89, in open_SSL
    header_transport.open()
  File "C:\Environment\Python\Python311\Lib\site-packages\nebula3\fbthrift\transport\THeaderTransport.py", line 247, in open
    return self.getTransport().open()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Environment\Python\Python311\Lib\site-packages\nebula3\fbthrift\transport\TTransport.py", line 173, in open
    return self.__trans.open()
           ^^^^^^^^^^^^^^^^^^^
  File "C:\Environment\Python\Python311\Lib\site-packages\nebula3\fbthrift\transport\TSocket.py", line 301, in open
    raise TTransportException(TTransportException.NOT_OPEN, msg)
nebula3.fbthrift.transport.TTransport.TTransportException: socket error connecting to host 127.0.0.1, port 3699 (('127.0.0.1', 3699)): TimeoutError('timed out')

Description:

Nebula's default port had been changed to 9669 since 2.0.1-RC. Latest version still using 9669 port.

How do you solve it?

Change port variable's value

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e96af4f) 77.62% compared to head (337d91e) 77.62%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #272 +/- ## ======================================= Coverage 77.62% 77.62% ======================================= Files 18 18 Lines 2409 2409 ======================================= Hits 1870 1870 Misses 539 539 ```

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[wey-gu]

Thanks @LaoshuBaby for the contribution and welcome to the community!