build(deps): update capnp requirement from 0.14.0 to 0.15.3 in /gst-depth-meta-rs

Updates the requirements on capnp to permit the latest version.

Commits

• abed264 prepare for capnp-v0.15.3 release
• 25eb04f deprecate HasTypeId::type_id()
• 5ad7849 update BuilderArena comment
• 8888443 add doc comments for BuilderSegment
• 72b5a1c Clippy/general (#361)
• f20dea2 prepare for capnp-futures-v0.15.1 release
• b5d52dd fix some clippy::uninlined_format_args
• 697e59e split up big type, as suggested by clippy
• 37a7b49 prepare for capnpc-v0.15.2 release
• 117bc97 regenerate code to eliminate clippy warnings
• Additional commits viewable in compare view