Bump golang.org/x/tools from 0.20.0 to 0.21.0 in /hack/goimports #917

Job	Run time
Unit Test	1m 43s
Stage	56s
Acceptance Test (kindest/node:v1.23.17@sha256:14d0a9a892b943866d7e6be119a06871291c517d279aedb816a...	9m 33s
Acceptance Test (kindest/node:v1.24.17@sha256:bad10f9b98d54586cba05a7eaa1b61c6b90bfc4ee174fdc43a7...	9m 4s
Acceptance Test (kindest/node:v1.25.16@sha256:e8b50f8e06b44bb65a93678a65a26248fae585b3d3c2a669e5c...	9m 59s
Acceptance Test (kindest/node:v1.26.14@sha256:5d548739ddef37b9318c70cb977f57bf3e5015e4552be4e27e5...	9m 1s
Acceptance Test (kindest/node:v1.27.11@sha256:681253009e68069b8e01aad36a1e0fa8cf18bb0ab3e5c4069b2...	6m 44s
Acceptance Test (kindest/node:v1.28.7@sha256:9bc6c451a289cf96ad0bbaf33d416901de6fd632415b076ab05f...	7m 19s
Acceptance Test (kindest/node:v1.29.2@sha256:51a1434a5397193442f0be2a297b488b6c919ce8a3931be0ce82...	5m 46s
Test	1s
Release	0s
	1h 0m 6s

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