chore: Upgrade sdk to ^3.7.0

[nielsenko]

Bump, format, and use new _ parameter (no longer an actual variable).

Fixes: #237

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[codecov]

Codecov Report

❌ Patch coverage is 95.71984% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.41%. Comparing base (3ab7119) to head (6143085).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/message/response.dart	75.00%	6 Missing ⚠️
lib/src/adapter/io/io_relic_web_socket.dart	77.77%	2 Missing ⚠️
lib/src/io/static/static_handler.dart	95.74%	2 Missing ⚠️
lib/src/middleware/middleware_logger.dart	84.61%	2 Missing ⚠️
lib/src/relic_server.dart	90.47%	2 Missing ⚠️
...c/headers/typed/headers/authentication_header.dart	91.66%	1 Missing ⚠️
...rc/headers/typed/headers/authorization_header.dart	93.75%	1 Missing ⚠️
...ib/src/headers/typed/headers/forwarded_header.dart	95.45%	1 Missing ⚠️
...eaders/typed/headers/permission_policy_header.dart	94.73%	1 Missing ⚠️
lib/src/io/static/cache_busting_config.dart	80.00%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
+ Coverage   91.33%   91.41%   +0.07%     
==========================================
  Files          89       89              
  Lines        3428     3458      +30     
  Branches     1763     1763              
==========================================
+ Hits         3131     3161      +30     
  Misses        297      297              

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