Update ovos-skill-hello-world requirement in /requirements

Updates the requirements on [ovos-skill-hello-world](https://github.com/OpenVoiceOS/skill-ovos-hello-world) to permit the latest version.
- [Release notes](https://github.com/OpenVoiceOS/skill-ovos-hello-world/releases)
- [Changelog](https://github.com/OpenVoiceOS/skill-ovos-hello-world/blob/dev/CHANGELOG.md)
- [Commits](OpenVoiceOS/skill-ovos-hello-world@V0.0.4a2...V0.0.4a6)

---
updated-dependencies:
- dependency-name: ovos-skill-hello-world
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/skills-essential.txt

@@ -4,7 +4,7 @@ ovos-skill-alerts>=0.0.1a6
 ovos-skill-personal~=0.0, >=0.0.4a1
 ovos-skill-naptime~=0.2, >=0.2.2
 ovos-skill-date-time>=0.2.3a4
-ovos-skill-hello-world~=0.0, >=0.0.4a2
+ovos-skill-hello-world~=0.0
 ovos-skill-parrot
 # TODO - publish
 # https://github.com/OpenVoiceOS/skill-ovos-boot-finished