[ci] Roll pinned stable toolchain (#2849)

Co-authored-by: Joshua Liebow-Feeser <joshlf@users.noreply.github.com>

Author: google-pr-creation-bot

Cargo.toml

@@ -84,7 +84,7 @@ no-zerocopy-panic-in-const-and-vec-try-reserve-1-57-0 = "1.57.0"
 
 [package.metadata.ci]
 # The versions of the stable and nightly compiler toolchains to use in CI.
-pinned-stable = "1.91.1"
+pinned-stable = "1.92.0"
 pinned-nightly = "nightly-2025-12-14"
 
 [package.metadata.docs.rs]