chore: update nightly toolchain used in CI

Author: Frando

.github/workflows/ci.yaml

@@ -204,7 +204,7 @@ jobs:
     - uses: actions/checkout@v5
     - uses: dtolnay/rust-toolchain@master
       with:
-        toolchain: nightly-2024-11-30
+        toolchain: nightly-2025-09-28
     - name: Install sccache
       uses: mozilla-actions/sccache-action@v0.0.9
 

.github/workflows/docs.yaml

@@ -32,7 +32,7 @@ jobs:
     - uses: actions/checkout@v5
     - uses: dtolnay/rust-toolchain@master
       with:
-        toolchain: nightly-2024-11-30
+        toolchain: nightly-2025-09-28
     - name: Install sccache
       uses: mozilla-actions/sccache-action@v0.0.9