chore(deps): update nginx docker tag to v1.26.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
nginx	minor	1.25.5-alpine -> 1.26.0-alpine

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[github-actions[bot]]

:warning: Chart oci://ghcr.io/cloudoperators/greenhouse/charts/ui:0.1.1 already exists in OCI registry. Please increment the chart version.

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