chore: fix code scanning alerts

[thisisabhash]

Issue #, if available:
Fix code scanning alerts
https://github.com/aws-amplify/amplify-ui-swift-authenticator/security/code-scanning/3
https://github.com/aws-amplify/amplify-ui-swift-authenticator/security/code-scanning/2
https://github.com/aws-amplify/amplify-ui-swift-authenticator/security/code-scanning/1

Description of changes:
Add permissions block for GITHUB_TOKEN

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.39%. Comparing base (fd86328) to head (ac9095d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #109   +/-   ##
=======================================
  Coverage   44.39%   44.39%           
=======================================
  Files          44       44           
  Lines        2462     2462           
=======================================
  Hits         1093     1093           
  Misses       1369     1369           

Flag	Coverage Δ
Authenticator	44.39% <ø> (ø)

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