fix(deps): update dependency koa to ^2.15.3 #1986

Job	Run time
prerequisite	1m 35s
version-generator	8s
docker-build (linux/amd64, amd64, auth)	1m 17s
docker-build (linux/amd64, amd64, backend)	1m 17s
docker-build (linux/amd64, amd64, frontend)	1m 36s
docker-build (linux/arm64, arm64, auth)	4m 20s
docker-build (linux/arm64, arm64, backend)	5m 7s
docker-build (linux/arm64, arm64, frontend)	4m 4s
auth	1m 31s
frontend	33s
backend	5m 2s
codeql-analyze (javascript, ./.github/codeql/source.yml)	2m 13s
integration-test	2m 35s
graphql (auth)	2m 48s
codeql-analyze (javascript, ./.github/codeql/tests.yml)	1m 26s
mock-account-servicing-entity	38s
token-introspection	37s
graphql (backend)	2m 36s
Docker Grype Scan (linux/amd64, amd64, auth)	23s
Docker Trivy Scan (linux/amd64, amd64, auth)	11s
Docker Grype Scan (linux/amd64, amd64, backend)	17s
Docker Trivy Scan (linux/amd64, amd64, backend)	19s
Docker Grype Scan (linux/amd64, amd64, frontend)	19s
Docker Trivy Scan (linux/amd64, amd64, frontend)	14s
Docker Grype Scan (linux/arm64, arm64, auth)	22s
Docker Grype Scan (linux/arm64, arm64, backend)	21s
Docker Trivy Scan (linux/arm64, arm64, auth)	11s
Docker Trivy Scan (linux/arm64, arm64, backend)	15s
Docker Grype Scan (linux/arm64, arm64, frontend)	18s
Docker Trivy Scan (linux/arm64, arm64, frontend)	18s
node-build	39s
Push to registry	0s
Push multi-arch manifest list	0s
generate-release	0s
	43m 30s

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