For #12151 - Add support for empty step value in TimePicker (backport #12802)

[mergify]

This is an automatic backport of pull request #12802 done by Mergify.
Cherry-pick of 9da5dd7 has failed:

On branch mergify/bp/releases/106.0/pr-12802
Your branch is up to date with 'origin/releases/106.0'.

You are currently cherry-picking commit 9da5dd7d0b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   components/browser/engine-gecko/src/main/java/mozilla/components/browser/engine/gecko/prompt/GeckoPromptDelegate.kt
	modified:   components/browser/engine-gecko/src/test/java/mozilla/components/browser/engine/gecko/prompt/GeckoPromptDelegateTest.kt

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/changelog.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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