Try to make GitHub Actions run with rust 1.88.0

Author: rhigman

.github/workflows/build_test_and_check.yml

@@ -43,6 +43,8 @@ jobs:
             ~/.cargo/git/db/
             target/
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - name: Set Rust toolchain version
+        run: rustup override set stable
       - name: Build binary
         run: cargo build -vv
   test: