fix(deps): update github.com/googlecloudplatform/k8s-config-connector/mockgcp digest to 9b78bf4

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
github.com/GoogleCloudPlatform/k8s-config-connector/mockgcp	require	digest	4bde5b3 -> 9b78bf4

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