fix: Correctly handle race condition if voice keepalive procs while reconnecting

[silasary]

Pull Request Type

• Feature addition
• Bugfix
• Documentation update
• Code refactor
• Tests improvement
• CI/CD pipeline enhancement
• Other: [Replace with a description]

Description

During Voice reconnect, we briefly set the websocket to None: https://github.com/interactions-py/interactions.py/blob/stable/interactions/api/voice/voice_gateway.py#L222-L236

If the keepalive triggers during that await, self.ws is None, and we get a lovely error.

Changes

Do a null check before checking self.ws.connected

Related Issues

https://canary.discord.com/channels/789032594456576001/1095994644929708083/1118804300357967872
https://github.com/interactions-py/interactions.py/actions/runs/5285126118/jobs/9563299904

Test Scenarios

Python Compatibility

• I've ensured my code works on Python 3.10.x
• I've ensured my code works on Python 3.11.x

Checklist

• I've run the pre-commit code linter over all edited files
• I've tested my changes on supported Python versions
• I've added tests for my code, if applicable
• I've updated / added documentation, where applicable

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.05 ⚠️

Comparison is base (9fc1aed) 60.19% compared to head (b28b927) 60.14%.

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Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1449      +/-   ##
============================================
- Coverage     60.19%   60.14%   -0.05%     
============================================
  Files           139      139              
  Lines         14714    14714              
============================================
- Hits           8857     8850       -7     
- Misses         5857     5864       +7     

Impacted Files	Coverage Δ
interactions/api/voice/voice_gateway.py	78.62% <100.00%> (+0.38%)	⬆️

... and 3 files with indirect coverage changes

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