[ci] Roll pinned nightly toolchain

[google-pr-creation-bot]

Automated changes by create-pull-request GitHub action

[jswrenn]

The automatic roll is failing because of rust-lang/rust#123168, which adds size_of and align_of to the prelude. The automatic fixes applied by the roller (specifically, to un-qualify those calls) are invalid on our MSRV. This manifests as name resolution errors.

[joshlf]

The automatic roll is failing because of rust-lang/rust#123168, which adds size_of and align_of to the prelude. The automatic fixes applied by the roller (specifically, to un-qualify those calls) are invalid on our MSRV. This manifests as name resolution errors.

Fixed in #1413.