chore: Move CI to use Cargo's v2 layout

Author: ranger-ross

.github/workflows/linux.yml

@@ -38,4 +38,5 @@ jobs:
     - name: Build and Test
       env:
         RUSTFLAGS: -D warnings
+        CARGO_UNSTABLE_BUILD_DIR_NEW_LAYOUT: true
       run: cargo run --manifest-path ci/Cargo.toml build-and-test

.github/workflows/mac.yml

@@ -34,4 +34,5 @@ jobs:
     - name: Build and Test
       env:
         RUSTFLAGS: -D warnings
+        CARGO_UNSTABLE_BUILD_DIR_NEW_LAYOUT: true
       run: cargo run --manifest-path ci/Cargo.toml build-and-test

.github/workflows/windows.yml

@@ -60,4 +60,5 @@ jobs:
     - name: Build and Test
       env:
         RUSTFLAGS: -D warnings
+        CARGO_UNSTABLE_BUILD_DIR_NEW_LAYOUT: true
       run: cargo run --manifest-path ci/Cargo.toml build-and-test