docs: update Epinio version to 1.13.8

[github-actions]

docs: update Epinio version

Update Epinio Version for EP on RD

1 file(s) updated with "\\[epinio helm chart 1.13.8\\]": * docs/installation/other_inst_scenarios/install_epinio_on_rancher_desktop.md

v1.13.8

# What's Changed

- Fix/log level (#2964)

# Usage

More info can be found in the [installation instructions](https://docs.epinio.io/installation/install_epinio).

Update Helm chart URL

1 file(s) updated with "\\(https://github.com/epinio/helm-charts/releases/tag/epinio-1.13.8\\)": * docs/installation/other_inst_scenarios/install_epinio_on_rancher_desktop.md

v1.13.8

# What's Changed

- Fix/log level (#2964)

# Usage

More info can be found in the [installation instructions](https://docs.epinio.io/installation/install_epinio).

GitHub Action workflow link

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