Fix typo in README.md

[obermeier]

Description

A backtick in the helm command leads to an error.

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• [ ] DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• [ ] Copyright and license header are present on all affected files

[sonarcloud[bot]]

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