fix(deps): update dependency @kubernetes/client-node to v0.20.0

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

plugins/kubernetes/package.json

@@ -46,7 +46,7 @@
     "@backstage/types": "workspace:^",
     "@kubernetes-models/apimachinery": "^1.1.0",
     "@kubernetes-models/base": "^4.0.1",
-    "@kubernetes/client-node": "0.19.0",
+    "@kubernetes/client-node": "0.20.0",
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
     "@material-ui/lab": "4.0.0-alpha.61",