chore(deps): update quay.io/oauth2-proxy/oauth2-proxy docker tag to v7.8.0

This MR contains the following updates:

Package	Type	Update	Change
quay.io/oauth2-proxy/oauth2-proxy (source)	Kustomization	minor	v7.7.1 -> v7.8.0

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Release Notes

oauth2-proxy/oauth2-proxy (quay.io/oauth2-proxy/oauth2-proxy)

v7.8.0

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