Replace claimName value to existingClaim to manage your PVC value for PostgreSQL chart. (#786)

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### Description of the change

Hello, following the documentation, I saw that there was a small error concerning the declaration of a PVC on the PostgreSQL part.
So I just changed this value from claimName to existingClaim

### Applicable issues

- Fixes #778

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/786
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.com>
Co-authored-by: yael-tramier <yael-tramier@noreply.gitea.com>
Co-committed-by: yael-tramier <yael-tramier@noreply.gitea.com>

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Gitea Version: 1.28.0+dev-528-ga5a645824f