golang:1.21-bookworm for kurl_proxy (#4137) #1609

Job	Run time
kurl-addon-changes-filter	7s
generate-tag	5s
image-deps-updater	45s
build-schema-migrations	51s
build-kurl-proxy	34s
build-web	2m 29s
generate-kots-release-notes-pr	3s
Run regression testing	0s
goreleaser	8m 48s
build-go-api	2m 3s
release-go-api-tagged	6m 18s
generate-kurl-addon	2m 42s
build-airgap	2m 50s
publish-kurl-addon	11s
validate-kurl-addon	20s
regression-test	0s
	28m 6s

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