ci: Use recent rust compiler version

Author: Rahix

.github/workflows/ci.yml

@@ -66,11 +66,11 @@ jobs:
       - name: Install Nightly Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: nightly-2022-06-13
+          toolchain: nightly-2023-08-08
           components: rustfmt
 
       # Actual test run
       - name: Generate chip description sources
-        run: make RUSTUP_TOOLCHAIN=nightly-2022-06-13
+        run: make RUSTUP_TOOLCHAIN=nightly-2023-08-08
       - name: Test-compile the crate
         run: cargo check --all-features