ci: use stable toolchain again

Now that the Rust for Linux job is moved forward to v6.14, we can use
Rust 1.86.0, i.e. the current stable, again.

Thus revert the previous change.

Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

.github/workflows/bindgen.yml

@@ -154,7 +154,7 @@ jobs:
       - name: Install stable
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.85.1
+          toolchain: stable
       - name: Install libtinfo
         if: matrix.os == 'ubuntu-latest'
         run: |

ci/test.sh

@@ -125,13 +125,13 @@ CONFIG_KUNIT=y
 CONFIG_RUST_KERNEL_DOCTESTS=y
 EOF
 
-  make -C linux KBUILD_VERBOSE=1 LLVM=1 -j$(($(nproc) + 1)) \
+  make -C linux LLVM=1 -j$(($(nproc) + 1)) \
       rustavailable \
       defconfig \
       rfl-for-bindgen-ci.config
 
   # Build Rust for Linux
-  make -C linux LLVM=1 KBUILD_VERBOSE=1 -j$(($(nproc) + 1)) \
+  make -C linux LLVM=1 -j$(($(nproc) + 1)) \
       samples/rust/rust_minimal.o \
       samples/rust/rust_print_main.o \
       drivers/net/phy/ax88796b_rust.o