Ci: fix MSRV build

Author: ogoffart

.github/workflows/ci.yaml

@@ -69,6 +69,7 @@ jobs:
                   if [ ! -f ./Cargo.lock ]; then
                     cargo update -p clap --precise 4.4.18
                     cargo update -p ahash --precise 0.8.7
+                    cargo update -p bumpalo --precise 3.14.0
                   fi
             - name: Run tests
               run: DYLD_FRAMEWORK_PATH=$Qt5_DIR/lib cargo test --verbose --all-features --workspace ${{ matrix.extra_args }} --exclude slint-node --exclude pyslint --exclude test-driver-node --exclude slint-node --exclude test-driver-nodejs --exclude test-driver-cpp --exclude mcu-board-support --exclude printerdemo_mcu --exclude uefi-demo --exclude slint-cpp