`PATCH .../hooks/{id}` previously reset webhook events to push-only and
cleared the branch filter and authorization header whenever they were
not included in the payload. Disabling a hook with `{"active": false}`
silently destroyed its configuration.
`BranchFilter` and `AuthorizationHeader` are now pointers so omitted
fields remain untouched, while empty strings can still be passed to
clear them explicitly.
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Co-authored-by: silverwind <me@silverwind.io>
Shudhanshu Singhandsilverwind
db23b5a192