fix: ensure recurring tasks are unlocked after being picked up (but not executed)

[matthewelwell]

Changes

Ensures that recurring tasks are unlocked after being picked up (but not executed) by the task processor.

How did you test this code?

Updated existing unit test.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2023 3:36pm
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flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2023 3:36pm

[github-actions]

Uffizzi Preview deployment-31641 was deleted.

[codecov-commenter]

Codecov Report

Patch coverage: 96.66% and project coverage change: -0.01 ⚠️

Comparison is base (583e248) 95.43% compared to head (3cbbf11) 95.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2508      +/-   ##
==========================================
- Coverage   95.43%   95.43%   -0.01%     
==========================================
  Files         963      963              
  Lines       27061    27078      +17     
==========================================
+ Hits        25827    25843      +16     
- Misses       1234     1235       +1     

Impacted Files	Coverage Δ
...sk_processor/test_unit_task_processor_processor.py	98.39% <95.23%> (-0.44%)	⬇️
api/task_processor/models.py	92.30% <100.00%> (+0.15%)	⬆️
api/task_processor/processor.py	93.10% <100.00%> (-0.12%)	⬇️

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