Fix Windows CI issue.

It's unclear what's happening here besides a linking error.  The
relevant issues are: cross-rs/cross#1463 and
cross-rs/cross#1453.

Pinning to cross 0.2.5 and swtching to the Rust stable toolchain seems
to fix things for now.

.github/workflows/ci.yml

@@ -23,10 +23,15 @@ jobs:
         name: Install Rustup
         with:
           command: install-rustup
-          toolchain: nightly
+          toolchain: stable
           target: ${{ matrix.target }}
           profile: minimal
           default: true
+      - uses: FrancisRussell/ferrous-actions@v0.1.0-beta.1
+        name: Install cross (workaround for (https://github.com/cross-rs/cross/issues/1453))
+        with:
+          command: cargo install
+          args: cross --git https://github.com/cross-rs/cross --tag v0.2.5
       - uses: FrancisRussell/ferrous-actions@v0.1.0-beta.1
         name: Cargo build
         with: 

.github/workflows/release.yml

@@ -38,10 +38,15 @@ jobs:
         name: Install Rustup
         with:
           command: install-rustup
-          toolchain: nightly
+          toolchain: stable
           target: ${{ matrix.target }}
           profile: minimal
           default: true
+      - uses: FrancisRussell/ferrous-actions@v0.1.0-beta.1
+        name: Install cross (workaround for (https://github.com/cross-rs/cross/issues/1453))
+        with:
+          command: cargo install
+          args: cross --git https://github.com/cross-rs/cross --tag v0.2.5
       - uses: FrancisRussell/ferrous-actions@v0.1.0-beta.1
         name: Build
         with: