build(deps): update capnp requirement from 0.14.0 to 0.16.0 in /gst-depth-meta-rs

Updates the requirements on capnp to permit the latest version.

Commits

• 93df012 update version in comment
• 8e2c999 prepare for 0.16.0 release
• a235fb3 cargo fmt
• 0bfb8d7 remove FromStructReader and FromStructBuilder in favor of core::convert::From
• 32d5a61 remove deprecated MessageSize::plus_eq
• 1f722ad remove 'FromU16' trait
• b25434a Merge pull request #336 from danieleades/into-u16
• 1d4c541 mark unsafe methods
• ff5fe8a Merge pull request #352 from danieleades/type_id_trait
• 6cf3e70 Merge pull request #365 from capnproto/remove-refcell-no-refactor
• Additional commits viewable in compare view