Bumped dependencies to support Flutter 3 with Dart 3

[AngeloAvv]

If you use connectivity_plus for other purposes, you cannot use the latest versions supported by Flutter3 and Dart 3.
I took the chance to bump the dependencies for this awesome package as it's not been updated for a while.

I also updated the CI script, If you want me to perform some changes, feel free to point them out here.

Closes #57

[jogboms]

Hey @AngeloAvv
This is really thoughtful of you but I would prefer the version to be v3.0.0 due to the sdk update

[AngeloAvv]

Done! ✅

[jogboms]

Thanks @AngeloAvv

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (72bc05b) 100.00% compared to head (ec6317a) 100.00%.

❗ Current head ec6317a differs from pull request most recent head 28c1d2d. Consider uploading reports for the commit 28c1d2d to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #58   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           49        49           
=========================================
  Hits            49        49           

Impacted Files	Coverage Δ
lib/src/utils.dart	100.00% <100.00%> (ø)

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