fix(deps): update accelleran/du-metrics-server docker tag to v3.0.4

[acc-renovate[bot]]

This PR contains the following updates:

Package	Update	Change
accelleran/du-metrics-server	patch	3.0.3 -> 3.0.4

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Release Notes

accelleran/srsRAN_Accelleran (accelleran/du-metrics-server)

### [`v3.0.4`](https://redirect.github.com/accelleran/srsRAN_Accelleran/compare/3.0.3...3.0.4) [Compare Source](https://redirect.github.com/accelleran/srsRAN_Accelleran/compare/3.0.3...3.0.4)

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