[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 88.85%. Comparing base (46e2a46) to head (1e2f93c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2572   +/-   ##
=======================================
  Coverage   88.85%   88.85%           
=======================================
  Files          20       20           
  Lines        5312     5312           
=======================================
  Hits         4720     4720           
  Misses        592      592           

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