Fix code scanning alert - No HEALTHCHECK defined

[2lambda123]

Tracking issue for:

• [ ] https://github.com/2lambda123/SeleniumHQ-docker-selenium/security/code-scanning/5

[git-greetings[bot]]

Thanks @2lambda123 for opening this issue!

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[gitginie[bot]]

@2lambda123! Thank you for your contribution to this repository! We appreciate your effort in opening issue. Happy coding!

[git-greetings[bot]]

Issues Details of @2lambda123 in SeleniumHQ-docker-selenium :	OPEN	CLOSED	TOTAL
14	0	14

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