flux bootstrap github fails for repositories with custom properties

[stefanprodan]

Discussed in #4957

^{Originally posted by andreistefanzx August 28, 2024}
When using the flux bootstrap github command with a repository that has custom properties, the command fails with the following error:

✗ failed to get Git repository "https://github.com/ORG_NAME/REPO_NAME": provider error: json: cannot unmarshal array into Go struct field Repository.custom_properties of type string

Command used:

flux bootstrap github \
  --components-extra=image-reflector-controller,image-automation-controller \
  --owner="OWNER" \
  --repository="REPO_NAME" \
  --path=k8s/clusters/prod/CLUSTER_NAME \
  --branch="main" \
  --registry=REGISTRY_NAME \
  --toleration-keys=TOLERATION_NAME \
  --network-policy=true \
  --token-auth

[stefanprodan]

Fixed upstream:

• Error when parsing repository that uses multiselect custom-properties google/go-github#3229
• feat!: Widen CustomProperties type to map[string]interface{} to align with GitHub API google/go-github#3230
• Update dependencies go-git-providers#286