Cache key fix

[kp-cat]

Describe the purpose of your pull request

• Fix sdk_key parameter passing in ConfigService used for cache_key calculation.

Requirement checklist (only if applicable)

• I have covered the applied changes with automated tests.
• I have executed the full automated test set against my changes.
• I have validated my changes against all supported platform versions.
• I have read and accepted the contribution agreement.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.52%. Comparing base (38e5209) to head (6ebd079).

Files with missing lines	Patch %	Lines
lib/configcat/version.rb	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   98.52%   98.52%           
=======================================
  Files          40       40           
  Lines        3314     3324   +10     
=======================================
+ Hits         3265     3275   +10     
  Misses         49       49           

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