docker(deps): bump kyma-project/external/alpine from 3.14.2 to 3.15.4 in /components/central-application-gateway

[dependabot]

Bumps kyma-project/external/alpine from 3.14.2 to 3.15.4.

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[dependabot]

The following labels could not be found: docker.

[kyma-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[koala7659]

LGTM

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[kyma-bot]

@dependabot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pre-main-kyma-integration-k3d-telemetry	bc4e7fd	link	true	/test pre-main-kyma-integration-k3d-telemetry
pre-main-kyma-integration-k3d-istio-production	bc4e7fd	link	true	/test pre-main-kyma-integration-k3d-istio-production
pre-kyma-tests-components-application-connector	bc4e7fd	link	true	/test pre-kyma-tests-components-application-connector
pre-main-kyma-integration-k3d-istio-evaluation	bc4e7fd	link	true	/test pre-main-kyma-integration-k3d-istio-evaluation
pre-main-kyma-gardener-azure-alpha-prod	566d324	link	false	/test pre-main-kyma-gardener-azure-alpha-prod

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[koala7659]

/test pre-main-kyma-gardener-azure-alpha-prod