Merge 4.28.0 into master (#4257)

.circleci/config.yml

.github/dependabot.yml

android/app/build.gradle

android/gradle/wrapper/gradle-wrapper.properties

app/actions/createDiscussion.ts

app/actions/customEmojis.ts

app/containers/ActionSheet/ActionSheet.tsx

app/containers/ActionSheet/BottomSheetContent.tsx

app/containers/ActionSheet/Item.tsx

app/containers/ActionSheet/Provider.tsx

app/containers/ActionSheet/styles.ts

app/containers/Button/Button.stories.js

app/containers/Button/Button.test.tsx

app/containers/Button/__snapshots__/Button.stories.storyshot

app/containers/Button/index.tsx

app/containers/Check.tsx

app/containers/CustomIcon/index.tsx

app/containers/CustomIcon/mappedIcons.js

app/containers/CustomIcon/selection.json

app/containers/DirectoryItem/index.tsx