fix: cmd/kubeapps-apis/plugins/fluxv2/packages/v1alpha1/testdata/Dock…

…erfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN11-CURL-3065656
- https://snyk.io/vuln/SNYK-DEBIAN11-CURL-3065656
- https://snyk.io/vuln/SNYK-DEBIAN11-CURL-5955037
- https://snyk.io/vuln/SNYK-DEBIAN11-CURL-5955037
- https://snyk.io/vuln/SNYK-DEBIAN11-LIBWEBP-5893094

cmd/kubeapps-apis/plugins/fluxv2/packages/v1alpha1/testdata/Dockerfile

@@ -3,7 +3,7 @@
 
 # this Dockerfile is for building a docker image for a pod that can be deployed into a k8s cluster
 # that serves some of the content of test-data (index.yaml, charts .tgz)
-FROM nginx:1.23.1
+FROM nginx:1.25.2
 COPY ./nginx.conf /etc/nginx/nginx.conf
 
 # only has a single user: foo, password: bar