Update pkg/runtime dependency from v0.76.0 to v0.78.0 and add
WithSystemCertPool() options to maintain backward compatibility
with the existing extend approach (system CAs + user CA).
This ensures source-controller continues to work with both system
and user-provided CA certificates, maintaining the same behavior
as before the pkg/runtime/secrets API changes.
Signed-off-by: cappyzawa <cappyzawa@gmail.com>
ba14962c1f