chore(helm): bump chart version to 0.7.1

[o-pauloroberto]

Bumps chart to 0.7.1 to publish the fix from #3421 under a distinct version.

The fix allows externalSecret.enabled=true as a valid source for DATABASE_URL when database.engine=postgresql, preventing a false-positive validation failure at helm template time.

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Summary by cubic

Bumps Helm chart chart-deco-studio to version 0.7.1 to publish the validation fix for DATABASE_URL sources. This version allows externalSecret.enabled=true with database.engine=postgresql, preventing a false-positive failure during helm template.

^{Written for commit 2f2ecec. Summary will update on new commits. Review in cubic}