fix: not disposing autoDispose family provider

[jeiea]

Close #2480.

[codecov]

Codecov Report

Merging #2481 (6826e5b) into master (41cdfa5) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2481      +/-   ##
==========================================
- Coverage   95.25%   95.24%   -0.01%     
==========================================
  Files          53       53              
  Lines        2253     2252       -1     
==========================================
- Hits         2146     2145       -1     
  Misses        107      107              

Impacted Files	Coverage Δ
...lib/src/change_notifier_provider/auto_dispose.dart	100.00% <ø> (ø)
packages/riverpod/lib/src/async_notifier/base.dart	100.00% <ø> (ø)
packages/riverpod/lib/src/framework/family.dart	100.00% <ø> (ø)
.../lib/src/state_notifier_provider/auto_dispose.dart	100.00% <ø> (ø)
packages/riverpod/lib/src/framework/container.dart	97.74% <100.00%> (-0.02%)	⬇️