fix: Bump default relay proxy version from 8.10.5 to 8.19.1

[keelerm84]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

Related issues

The chart (v3.6.0) has appVersion: "8.10.5" hardcoded in Chart.yaml, but the latest stable Relay Proxy is 8.19.1. Deployments silently run the outdated version unless image.tag is set explicitly in values.

Describe the solution you've provided

Bumps the appVersion in Chart.yaml from 8.10.5 to 8.19.1 so that the default deployment uses the latest stable v8 relay proxy release.

Describe alternatives you've considered

N/A

Additional context

Reference: #69

Link to Devin session: https://app.devin.ai/sessions/73b9015f9dea4e5d82964673755a2dfb
Requested by: @keelerm84

---

Note

Medium Risk
Changes the default ld-relay container image tag (via .Chart.AppVersion) and associated labels, which could alter runtime behavior for users relying on chart defaults. Scope is limited to a version bump with updated golden manifests.

Overview
Updates the chart’s default Relay Proxy version by bumping Chart.yaml appVersion from 8.10.5 to 8.19.1, which in turn changes the default image tag (image.tag | default .Chart.AppVersion).

Refreshes the golden test manifests to expect the new app.kubernetes.io/version label value and launchdarkly/ld-relay:8.19.1 image reference.

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