plugins/{kubernetes,techdocs}-backend: fix circular imports

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/kubernetes-backend/src/plugin.ts

@@ -20,7 +20,7 @@ import {
 } from '@backstage/backend-plugin-api';
 import { catalogServiceRef } from '@backstage/plugin-catalog-node/alpha';
 
-import { KubernetesBuilder } from '@backstage/plugin-kubernetes-backend';
+import { KubernetesBuilder } from './service';
 
 import {
   type AuthenticationStrategy,

plugins/techdocs-backend/src/plugin.ts

@@ -38,7 +38,7 @@ import {
   techdocsPreparerExtensionPoint,
   techdocsPublisherExtensionPoint,
 } from '@backstage/plugin-techdocs-node';
-import { createRouter } from '@backstage/plugin-techdocs-backend';
+import { createRouter } from './service';
 import { catalogServiceRef } from '@backstage/plugin-catalog-node/alpha';
 import * as winston from 'winston';