chore(deps): bump capnpc from 0.18.0 to 0.19.0

[dependabot[bot]]

Bumps capnpc from 0.18.0 to 0.19.0.

Commits

• 4e1a30a a couple more changelog items
• 6dbd38e prepare for 0.19 release
• 79e4af6 list_list::Builder::set() takes an 'impl SetterInput'
• 3b2ceef update text_list::Builder::set() to use impl SetterInput
• 4973da3 add #[inline] attribute on SetterInput impls
• 6e9d0fc update version number in doc example
• d0bdd79 add test coverage for NoAllocBufferSegments::from_buffer
• 0cf983d use AsRef instead of Deref in NoAllocBufferSegments
• 857b324 generalize SingleSegmentAllocator to take any type that implements AsMut<[u8]>
• 9b2e8fa impl Default for message;:TypedBuilder<T, HeapAllocator>
• Additional commits viewable in compare view

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