chore(deps): bump capnp from 0.12.1 to 0.13.7 in /experimental/encoding_bench

[dependabot[bot]]

Bumps capnp from 0.12.1 to 0.13.7.

Commits

• 79a761d prepare for capnp-v0.13.7 release
• feb7c98 remove list pointer munging and add tests
• b736f2b prepare for 0.13.6 release
• 8257850 Add blanket impl Allocator for &mut A where A: Allocator
• fb230d4 update pubsub example to use tokio 0.3.0
• a0bf5bb update calculator rpc example to use tokio 0.3.0
• 1d76ce1 update hello-world rpc example to use tokio 0.3.0
• 9c2a11b add comment for get_connection_state
• 7fb33a3 minor simplification in twoparty::VatNetwork::connect()
• d7b1791 prepare for capnp-v0.13.5 release
• Additional commits viewable in compare view

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