chore: prepare Tokio v1.13.0

[Darksonn]

1.13.0 (October 29, 2021)

Fixed

• sync: fix Notify to clone the waker before locking its waiter list (#4129)
• tokio: add riscv32 to non atomic64 architectures (#4185)

Added

• net: add poll_{recv,send}_ready methods to udp and uds_datagram (#4131)
• net: add try_*, readable, writable, ready, and peer_addr methods to split halves (#4120)
• sync: add blocking_lock to Mutex (#4130)
• sync: add watch::Sender::send_replace (#3962, #4195)
• sync: expand Debug for Mutex<T> impl to unsized T (#4134)
• tracing: instrument time::Sleep (#4072)
• tracing: use structured location fields for spawned tasks (#4128)

Changed

• io: add assert in copy_bidirectional that poll_write is sensible (#4125)
• macros: use qualified syntax when polling in select! (#4192)
• runtime: handle block_on wakeups better (#4157)
• task: allocate callback on heap immediately in debug mode (#4203)
• tokio: assert platform-minimum requirements at build time (#3797)

Documented

• docs: conversion of doc comments to indicative mood (#4174)
• docs: add returning on the first error example for try_join! (#4133)
• docs: fixing broken links in tokio/src/lib.rs (#4132)
• signal: add example with background listener (#4171)
• sync: add more oneshot examples (#4153)
• time: document Interval::tick cancel safety (#4152)

[Darksonn]

This PR is pending resolution of #4195.