feat: upgrade dependencies to support casbin 2.1.0 and sqlx 0.7

[MuZhou233]

Fix #85
Based on #80 and #86

• casbin v2.1 contains breaking changes
• sqlx v0.7 contains breaking changes, offline and actix related feature flags are removed.

EDIT:

• brew upgrade issue https://github.com/casbin-rs/sqlx-adapter/actions/runs/7818318608/job/21345813030?pr=87 and fix brew update followed by brew upgrade fails for Python's 2to3 conflict (December 2022) actions/setup-python#577

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (c1e50ca) 64.56% compared to head (47bc230) 65.28%.

Files	Patch %	Lines
src/actions.rs	57.14%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   64.56%   65.28%   +0.72%     
==========================================
  Files           4        3       -1     
  Lines         364      363       -1     
==========================================
+ Hits          235      237       +2     
+ Misses        129      126       -3     

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