Fix/13 fix race condition with in memory driver

[misikdmytro]

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Description

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• [ ] 🔥 Feature: A new feature
• [x] 🩹 Fix: A bug fix
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• [x] I have performed a self-review of my code.
• [x] I have commented my code, particularly in hard-to-understand areas.
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Related Issues

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• Fixes: #13

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Codecov Report

Attention: Patch coverage is 74.02597% with 40 lines in your changes missing coverage. Please review.

Project coverage is 86.15%. Comparing base (89cda5e) to head (79d944d). Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
config.go	49.09%	26 Missing and 2 partials :warning:
internal/utils/lock.go	76.92%	4 Missing and 2 partials :warning:
inmemory.go	91.48%	3 Missing and 1 partial :warning:
planner.go	88.23%	2 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14 +/- ## =========================================== - Coverage 87.67% 86.15% -1.52% =========================================== Files 9 9 Lines 365 419 +54 =========================================== + Hits 320 361 +41 - Misses 40 51 +11 - Partials 5 7 +2 ```

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