fix(examples): Update target minikube-nginx-helm in examples

[MatteoVoges]

Proposed Changes

• Updated target minikube-nginx-helm with --force-fetch

• There was an error while running kapitan compile --fetch in examples/kubernetes

Steps To Reproduce

• git clone https://www.github.com/kapicorp/kapitan.git
• git submodule update --init
• poetry install
• kapitan compile --fetch
• Error:

  Error: template: ingress-nginx/templates/admission-webhooks/cert-manager.yaml:1:63: executing "ingress-nginx/templates/admission-webhooks/cert-manager.yaml" at <.Values.controller.admissionWebhooks.certManager.enabled>: nil pointer evaluating interface {}.enabled
  
  Use --debug flag to render out invalid YAML
  
  Compile error: failed to compile target: minikube-nginx-helm
  

Command used to fix

kapitan compile --force-fetch

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