fix(deps): update module github.com/platform-mesh/extension-manager-operator/api to v0.0.21 (#46)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/kcp-dev/logicalcluster/v3 v3.0.5
 	github.com/kcp-dev/multicluster-provider v0.2.0
 	github.com/pkg/errors v0.9.1
-	github.com/platform-mesh/extension-manager-operator/api v0.0.20
+	github.com/platform-mesh/extension-manager-operator/api v0.0.21
 	github.com/platform-mesh/golang-commons v0.1.19
 	github.com/prometheus/client_golang v1.23.0
 	github.com/rs/cors v1.11.1