Reactive container mixin upgrade

[Blackbaud-TrevorBurch]

No description provided.

[codecov]

Codecov Report

Merging #25 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #25   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          19     19           
  Lines         648    648           
  Branches       96     96           
=====================================
  Hits          648    648

Impacted Files	Coverage Δ
.../modules/vertical-tabset/vertical-tabset.module.ts	100% <ø> (ø)	⬆️
...dules/vertical-tabset/vertical-tabset.component.ts	100% <100%> (ø)	⬆️
...modules/sectioned-form/sectioned-form.component.ts	100% <100%> (ø)	⬆️
...modules/vertical-tabset/vertical-tabset.service.ts	100% <100%> (ø)	⬆️
...vertical-tabset/vertical-tabset-group.component.ts	100% <100%> (ø)	⬆️
.../modules/vertical-tabset/vertical-tab.component.ts	100% <100%> (ø)	⬆️

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