Bump github.com/aws/aws-sdk-go-v2/service/ecrpublic from 1.18.0 to 1.21.5 in /tools/release/image-mirror #633

Job	Run time
create-test-ref	2s
validate-markdown	19s
changes	9s
get-test-cases	16s
build	27m 36s
build-windows	27m 6s
packaging-rpm	46s
packaging-msi	2m 10s
packaging-deb	30s
run-test-case (statsd_mock)	25s
run-test-case (otlp_metric_mock)	24s
run-test-case (otlp_mock)	33s
run-test-case (otlp_grpc_exporter_metric_mock)	53s
run-test-case (otlp_grpc_exporter_trace_mock)	19s
run-test-case (otlp_http_exporter_metric_mock)	18s
run-test-case (otlp_http_exporter_trace_mock)	20s
run-test-case (sapm_exporter_trace_mock)	42s
run-test-case (signalfx_exporter_metric_mock)	58s
run-test-case (dynatrace_exporter_metric_mock)	51s
run-test-case (datadog_exporter_metric_mock)	30s
run-test-case (datadog_exporter_trace_mock)	27s
run-test-case (prometheus_mock)	21s
run-test-case (zipkin_mock)	26s
run-test-case (jaeger_mock)	33s
run-test-case (logzio_exporter_trace_mock)	27s
test-control-stript	20s
	1h 7m 41s

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