chore(deps): update ghcr.io/pact-foundation/pact-broker docker tag to v2.139.0-pactbroker2.119.0 and bump chart to v6.2.0

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/pact-foundation/pact-broker	minor	2.138.0-pactbroker2.119.0 → 2.139.0-pactbroker2.119.0

Additional changes made for release consistency:

• Bumped Helm chart version in charts/pact-broker/Chart.yaml: 6.1.2 → 6.2.0
• Updated chart docs in charts/pact-broker/README.md to reflect:
  • Chart version badge 6.2.0
  • Default broker.image.tag value 2.139.0-pactbroker2.119.0

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[ChrisJBurns]

@copilot Can you please bump the helm chart please with a minor version and ensure all docs are updated

[Copilot]

@copilot Can you please bump the helm chart please with a minor version and ensure all docs are updated

Done in 3dd5174.

I bumped the chart minor version to 6.2.0 and updated chart docs to match (version badge and default broker.image.tag values in charts/pact-broker/README.md).

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