chore: bump the rustfmt nightly to nightly-2026-08-23

Author: lfrancke

.github/workflows/pr_prek.yaml

@@ -9,7 +9,7 @@ permissions: {}
 
 env:
   CARGO_TERM_COLOR: always
-  RUST_TOOLCHAIN_VERSION: "nightly-2025-05-26"
+  RUST_TOOLCHAIN_VERSION: "nightly-2026-08-23"
   HADOLINT_VERSION: "v1.17.6"
   NIX_VERSION: "2.25.2"
 

.pre-commit-config.yaml

@@ -120,7 +120,7 @@ repos:
         files: \.rs$
         language: system
         # Pinning to a specific rustc version, so that we get consistent formatting
-        entry: cargo +nightly-2025-05-26 fmt --all -- --check
+        entry: cargo +nightly-2026-08-23 fmt --all -- --check
         stages: [pre-commit]
         pass_filenames: false