chore(camel-test-infra-observability): upgrade observability.prometheus.container to v3.15.0

[github-actions]

This PR updates the observability.prometheus.container container image to version v3.15.0.

Update Details

• Property: observability.prometheus.container
• Image: quay.io/prometheus/prometheus
• File: /home/runner/work/camel/camel/test-infra/camel-test-infra-observability/src/main/resources/org/apache/camel/test/infra/observability/services/container.properties
• Old version: v3.14.0
• New version: v3.15.0

Verification

Please verify:

• Container image version is compatible with existing tests
• No breaking changes in the updated version
• Tests pass with the new version

Run the following to rebuild the test infra:

mvn clean verify -pl camel-test-infra-observability

Then test the impacted components.

---

This PR was automatically created by the Container Version Upgrade workflow.

[gnodet-bot]

ℹ️ Local IT results for 6ec9758d29d47268c6189461fbbfd1cb9f808307

No component tests found that depend on camel-test-infra-observability. No integration tests to run.

Test-infra module: camel-test-infra-observability
Components tested: none found

Searched components/, integration-tests/, catalog/ for pom.xml files referencing this module — no consumers found.

Local integration tests run by Hermes on behalf of @gnodet
Tests run without -Dci.env.name to include ITs disabled on GitHub Actions CI

[apupier]

no automated tests