Bump github.com/aws/aws-sdk-go-v2/service/ecrpublic from 1.18.0 to 1.21.5 in /tools/release/image-mirror #624

Job	Run time
changes	4s
validate-markdown	11s
create-test-ref	2s
get-test-cases	3s
build	21m 33s
build-windows	20m 55s
packaging-deb	24s
packaging-rpm	43s
packaging-msi	1m 26s
run-test-case (statsd_mock)	20s
run-test-case (otlp_metric_mock)	20s
run-test-case (otlp_mock)	15s
run-test-case (otlp_grpc_exporter_metric_mock)	14s
run-test-case (otlp_grpc_exporter_trace_mock)	15s
run-test-case (otlp_http_exporter_metric_mock)	15s
run-test-case (otlp_http_exporter_trace_mock)	19s
run-test-case (sapm_exporter_trace_mock)	13s
run-test-case (signalfx_exporter_metric_mock)	16s
run-test-case (dynatrace_exporter_metric_mock)	13s
run-test-case (datadog_exporter_metric_mock)	19s
run-test-case (datadog_exporter_trace_mock)	18s
run-test-case (prometheus_mock)	18s
run-test-case (zipkin_mock)	20s
run-test-case (jaeger_mock)	20s
run-test-case (logzio_exporter_trace_mock)	16s
test-control-stript	12s
	50m 4s

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