Move away from bitnami

Find a suitable alternative for `bitnami` and switch to that repository.

```
I would say we should open a github issue to move away from bitnami: https://github.com/bitnami/charts/issues/35164

_Originally posted by @jeromy-cannon in https://github.com/hashgraph/solo-charts/pull/220#discussion_r2770680533_
```