update nightly

Author: newpavlov

.github/workflows/workspace.yml

@@ -109,8 +109,8 @@ jobs:
       - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@master
         with:
-          # We need Nightly for doc_auto_cfg
-          toolchain: nightly-2025-09-28
+          # We need Nightly for doc_cfg
+          toolchain: nightly-2026-01-25
       - uses: Swatinem/rust-cache@v2
       - name: Generate Docs
         env: