Codecoverage improve middlewares

[nicobistolfi]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 68.42105% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/api/middleware/token.go	41.17%	8 Missing and 2 partials ⚠️
internal/api/middleware/cors.go	85.71%	1 Missing and 1 partial ⚠️

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Files with missing lines	Coverage Δ
internal/api/middleware/rate_limiter.go	88.88% <100.00%> (+32.22%)	⬆️
internal/api/middleware/cors.go	86.66% <85.71%> (+32.12%)	⬆️
internal/api/middleware/token.go	35.92% <41.17%> (-0.35%)	⬇️