Bump golang.org/x/tools from 0.18.0 to 0.20.0 in /tools/workflow/linters #3998

Job	Run time
validate-markdown	9s
create-test-ref	2s
changes	4s
get-test-cases	4s
build	19m 36s
build-windows	17m 15s
packaging-deb	19s
packaging-msi	1m 23s
packaging-rpm	43s
run-test-case (statsd_mock)	15s
run-test-case (otlp_metric_mock)	22s
run-test-case (otlp_mock)	16s
run-test-case (otlp_grpc_exporter_metric_mock)	15s
run-test-case (otlp_grpc_exporter_trace_mock)	24s
run-test-case (otlp_http_exporter_metric_mock)	14s
run-test-case (otlp_http_exporter_trace_mock)	22s
run-test-case (sapm_exporter_trace_mock)	15s
run-test-case (signalfx_exporter_metric_mock)	24s
run-test-case (datadog_exporter_metric_mock)	27s
run-test-case (datadog_exporter_trace_mock)	17s
run-test-case (prometheus_mock)	23s
run-test-case (zipkin_mock)	25s
run-test-case (jaeger_mock)	24s
run-test-case (logzio_exporter_trace_mock)	27s
test-control-stript	13s
	44m 58s

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