[ci] Roll pinned nightly toolchain

[google-pr-creation-bot]

Automated changes by create-pull-request GitHub action

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.59%. Comparing base (0bee231) to head (ed7972b).

Additional details and impacted files

@@           Coverage Diff           @@
##           v0.8.x    #1927   +/-   ##
=======================================
  Coverage   87.59%   87.59%           
=======================================
  Files          16       16           
  Lines        5988     5988           
=======================================
  Hits         5245     5245           
  Misses        743      743           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jswrenn]

Whaaaat?

error: unknown lint: `non_local_definitions`
   --> src/lib.rs:206:10
    |
206 | #![allow(non_local_definitions, unknown_lints, unreachable_patterns)]
    |          ^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D unknown-lints` implied by `-D warnings`

@joshlf, do you know why the explicit allow of unknown_lints is being ignored?

Ah, it's order-dependent.